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## During the great war, which two states formed the central powers alliance?

During the great war, which two states formed the central powers alliance?

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## Ab is perpendicular to cd how many 90 angles are formed by the intersection

Ab is perpendicular to cd how many 90 angles are formed by the intersection

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## When any two lines intersect, four angles are formed. If the intersection is perpendicular, then each angle is 90°

When any two lines intersect, four angles are formed. If the intersection is perpendicular, then each angle is 90°

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## Question 3(Multiple Choice Worth 1 points) [FW.02]The pictures below show four Earth features. image 1 is a sinkhole, image 2 is a cave, image 3 is a geyser, and image 4 is a hotspring Which of these features are formed when hot groundwater is forced out through cracks in the Earth's surface? 1 and 2 1 and 4 2 and 3 3 and 4

Question 3(Multiple Choice Worth 1 points) [FW.02]The pictures below show four Earth features. image 1 is a sinkhole, image 2 is a cave, image 3 is a geyser, and image 4 is a hotspring Which of these features are formed when hot groundwater is forced out through cracks in the Earth’s surface? 1 and 2 1 and 4 2 and 3 3 and 4

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## 14. Within a single use of the scientific method, which of the following steps can only be performed after data is collected? A. Controls and variables are chosen. B. The initial experiment is designed. C. The initial hypothesis is formed. D. Conclusions are drawn.

The answer is D. Conclusions are drawn.
This is the only choice that can be done after data gathering, formulation, and analysis.

Other choices are in correct

A. Controls and variables are chosen.  (Identified before an experiment)
B. The initial experiment is designed. (Has been planned before an experiment is done.)
C. The initial hypothesis is formed. (Before the experiment a hypothesis is already drawn.

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## True or false If a diagonal is drawn in a parallelogram, then two congruent triangles are formed

True or false If a diagonal is drawn in a parallelogram, then two congruent triangles are formed

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## WILL GIVE BRAINLIEST PLEASE HELP! Please select the word from the list that best fits the definition stage in a star’s evolution formed as the core of a main sequence star uses up its helium and the outer layers escape into space

sorry I’m late
white dwarf is late stage in the life cycle of a comparatively low-mass main sequence star; formed when its core depletes its helium and its outer layers escape into space, leaving behind a hot, dense core. so the that would be the most reasonable answer thanks for posting, hope i helped

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## Why did Thurgood Marshall cite the Fourteenth Amendment to argue that segregation in public schools was unconstitutional? The Fourteenth Amendment guarantees equal protection under the law. The Fourteenth Amendment guarantees every child an education. The Fourteenth Amendment gave African Americans the right to vote. The Fourteenth Amendment formed the basis for Plessy v. Ferguson.

Why did Thurgood Marshall cite the Fourteenth Amendment to argue that segregation in public schools was unconstitutional? The Fourteenth Amendment guarantees equal protection under the law. The Fourteenth Amendment guarantees every child an education. The Fourteenth Amendment gave African Americans the right to vote. The Fourteenth Amendment formed the basis for Plessy v. Ferguson.

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## The pictures below show a cave and a geyser. Which of these statements is correct about the cave and geyser shown in the pictures? a. Both are formed when groundwater gets heated. b. Both are formed when groundwater reacts with the limestone in rocks. c. The cave is formed when groundwater reacts with the limestone in rocks and the geyser is formed when groundwater gets heated. d. The cave is formed when groundwater gets heated and the geyser is formed when groundwater reacts with the limestone in rocks.

I think the correct answer from the choices listed above is option C. The statement that is correct about  the cave and geyser would be that the cave is formed when groundwater reacts with the limestone in rocks and the geyser is formed when groundwater gets heated. Hope this answers the question.

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Posted in Biology

Which scientist formed his ideas about living things by performing observations with out using a microscope? A.Hooke B.malpighi C.van leeuwenhoek D.vesalius

The correct answer is D. Vesalius

Explanation:

Andreas Vesalius was a Flemish scientist and anatomist that lived during the 16th century, considered as the father of modern anatomy. During this life, Vesalius studied anatomy mainly using dissection and observing the tissues, organs, and structures in them, especially those in animals and humans. Also, he used his findings and ideas to create written works that were the base for later studies in anatomy. Besides this, as compound microscopes for studying living organisms had not been created during Vesalius time, he only used regular observations different to other scientists such as Hooke or Malpighi. Thus, it was Vesalius the one that formed his ideas by performing observations without using a microscope.

Posted in Biology

In 1953, who developed the model that is shown below?

The right answer is Watson and Crick.

The famous science journal “Nature” published an article of two pages, accompanied by one figure, titled “A Structure for Deoxyribose Nucleic Acid”. Its authors are James Dewey Watson (24) and Francis Crick (36).

They synthesized the work of their scientific colleagues and were able to explain with a remarkable art of deduction how the DNA molecule contained in the cells of all living beings was duplicated.

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Posted in Biology

The diagram shows the stages of the eukaryotic cell cycle. Which stage is labeled E in the diagram? mitosis interphase S phase G0 phase

The correct answer would be interphase.

The cell cycle is mainly divided into two phases: mitosis (M) and interphase.

Interphase is the phase in which a cell spends most of its time. It is the phase of growth and DNA replication.

It can be sub-divided into three stages:

• Gap 1 (G₁) phase which is represented by letter A in the given diagram.
• Synthesis (S) phase in which DNA replication takes place. It is represented by letter B in the given diagram.
• Gap 2 (G₂) phase which is represented by letter C in the given diagram.

Letter D represents mitosis (M) phase in which the actual division of the cell takes place.

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Posted in Biology

The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance lose energy during a change of state. Before the change, the atoms are close together but are able to slide past one another. Which arrow represents the change of state described above? M- gas to solid N-liquid to gas P-solid to liquid Q-liquid to solid

The correct option is this: Q – LIQUID TO SOLID.

Looking at the information given above, we are told that, before the change, the atoms are close together but are able to slide past one another. This is one of the characteristics of liquids, the particle in liquids are held together by inter molecular forces but they are still able to slide past one another. So, this tell us that, the substance was originally in the liquid state.

We are also told that, the atoms of the substance lose energy during the change of state. If there is a loss of energy, it means that, the little energy that the particles had before, which they were using to slide past one another is now removed and the particles becomes more compact. This implies that, the substance changes to solid. If the substance change to gas, there would have been gain of energy not loss. Therefore, the correction option is D. The substance change from liquid state to solid state.

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Posted in Biology

How do scientists think the earliest cells formed?

The earliest cells were formed by cells that don’t need oxygen to survive but they did produce oxygen to the water. The oxygen got sucked up by iron deposits in the waters at first. Then the oxygen started to oxygenate the water and air where as evolution interfered eucryotic cells formed and evolved creating life with a Biosphere.

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Posted in Biology

Which of the following statements is correct with respect to the photosynthetic pathway of grass or a cactus? In a cactus, carbon is fixed only during the day. In grass, carbon is fixed only during the night. In a cactus, carbon is fixed only during the night.

The answer is In a cactus, carbon is fixed only during the night.

There are three types of carbon fixation in plants – C3, C4, and CAM fixation. C3 and C4 plants open their stomata during the day while CAM plants open stomata during the night. Mostly, plants fix carbon during the day. However, plants in arid locations, such as cactuses, use CAM carbon fixation because of adaptation to water deficiency. Their stomata are closed during the day and water loss is reduced. In the night when is colder, stomata open and carbon dioxide enters through stomata.

Posted in Biology

A student takes notes in class as shown below. A. Uses an objective process Is updated constantly B. Is not objective Does not use a process Resists new information Which are the best titles for A and B? A: “Science”; B: “Pseudoscience” A: “Pseudoscience”; B: “Science” A: “Characteristics of Science”; B: “Limitations of Science” A: “Limitations of Science”; B: “Characteristics of Science”

A: “Science”; B: “Pseudoscience”

### Explanation;

• Science is a body of knowledge and the process of acquiring new knowledge, using scientific processes. Science uses objective processes and is updated constantly, when new ideas or information is discovered.
• Pseudoscience on the other hand, does not follow scientific processes. It is a practice or a belief that claims to be science, but does not follow specific criteria, that is ,an objective processes.
• Science is defined by criteria, which include, experimentation, replication of results, and peer review. Therefore, pseudoscience are beliefs and claims that do not meet such criteria.

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## If 0.9 grams of calcium burnt in air the weight of product formed is?

If 0.9 grams of calcium burnt in air the weight of product formed is?

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## If an angle formed by perpendicular lines has a ray in its interior coming from the vertex of the right angle, what do we call the relationship of the two angles? Select one: a. Right angles b. Corresponding angles c. Alternate interior angles d. Complementary angles

The ray divides one of the right angles into two smaller angles, but we are not told whether or not the smaller angles are equal or unequal.  These two angles are complementary angles.  Why? Because their sum is 90 degrees (definition of complementary angles).

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## In what kind of reaction is a compound formed from two reactants

The kind of reaction depends. if you have only one reactant ( element ) and another element make one element, hen it is called synthesis. If you have 2 compounds react , then it is called a double replacement reaction. if it is only one compound and one element, then it is called a single replacement reaction. if the reaction has say CH4 + 2 O2 ==> CO2 + H2O, then it is called a combustion reaction.

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## A newly formed planet or large asteroid becomes molten due to ______.

A newly formed planet or large asteroid becomes molten due to ______.

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## – How many moles of NaHCO3 can be produced from 125 mol of NaCl – How many moles Of H2O are produced when 6 mol of O2 is consumed in burning methyl alcohol, CH3OH, according to the following equation? – Solutions of iron(III) chloride, FeCl3, are used in photoengraving and to make ink. This compound can be made by the following reaction. a. How many moles of FeCl3 form from 31 mol of Cl2? b. How many moles of Fe are needed to combine with 5 mol of Cl2 by this reaction? c. If 0.62 mol of Fe is to be used by this reaction, how many moles of FeCl3 form? – Ammonia is produced synthetically by the reaction: a. Is this an exothermic or endothermic process? b. How many moles of NH3 are formed when 1 mol of N2 reacts with hydrogen? c. If 18 x 1023 molecules of H2 react with nitrogen, how many moles of NH3 are produced?

A positive cahnge of enthalpy, ΔH rxn = + 55 kJ/mol, for the forward reaction means that the reaction is endothermic, i.e. the reactants absorb energy and the products are higher in energy.

Activation energy is the difference in the energy level of the reactants and the peak in the potential energy diagram (the energy of the transition state).

For an endothermic reaction, the products will be closer in energy to the transition state than what the reactans will be; so, the activation energy of the reversed reaction is lower than the activation energy of the forward reaction.

Activation energy of reverse and forward reactions is related by:

Activation energy of reverse rxn = Activation energy of forward rxn – ΔH rxn

=> Activiation energy of reverse rxn = 102 kJ/mol – 55 kJ/mol = 47 kJ/mol

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## Heavenly bodies formed because of gravity T or F

Heavenly bodies formed because of gravity T or F

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## Key to the Spanish conquest of Mexico in the 1500s was that the Spanish a. formed alliances with the enemies of the Aztecs. b. shared a common religion with the majority of the native population. c. began by cultivating the trust of the Aztecs and then destroyed their empire. d. understood the importance of forming economic ties with the Aztecs.

The correct answer is – Andes Mountains.

The Andes Mountain Range is a result of a oceanic-continental convergence. This mountain range stretches alongside the western coast of the South American continent, in close proximity of the convergent boundary between the South American tectonic plate, which is continental one, and the Nazca tectonic plate, which is oceanic one.

The Nazca plate is subducting beneath the South American plate, and it managed to lift up the land in close proximity to the boundary. As the land was lifting up more and more, over time a mountain range was formed, the biggest and dominant one in South America, the Andean Mountain Range.

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## Which explains why an activated complex is a high-energy species? activated complexes form during endothermic reactions. activated complexes require new bonds to be made. activated complexes are stable species with strong covalent bonds. activated complexes cannot be formed in the reverse reaction direction?

There are two systems in the human body that are responsible for the coordination between the functions of different systems to achieve the unity of the living organism’s body. These two systems are the nervous system and the endocrine system. The action of the nervous system is fast and takes a short time, while the action of the endocrine system is slow and takes a long time.

The functional unit of the nervous system is the nerve cell or the neuron. The neuron consists of a cell body and the axon. The cell body starts with the dendrites that receive the messages or the impulses from other neurons or from different sense organs or receptors. These impulses are then transmitted through the cell body. The cell body contains a nucleus and different organelles which help the nerve cell to perform its functions. The nerve impulse is then transmitted to the axon.

The axon is an extension from the cell body. There are some cells called Schwan cells that secrete a myelin sheath to insulate the axon from the surrounding medium. The insulated axons have more ability to conduct the impulses than non-insulated axons. The axon ends with the terminal arborizations. The terminal arborizations of a nerve cell connect to the dendrites of the next cell or to the afferent organ. The gaps between the dendrites and the terminal arborizations are called the synapses.

The nerve impulse is an electrochemical phenomenon i.e. an electrical phenomenon with a chemical nature. The membrane of the axon acts as a barrier between an outside positively charged medium and an inside negatively charged medium. This makes a potential difference of  -70mV. This state is called the resting potential. When the membrane is subjected to a stimulus, the positive charges enter to inside and the negative charges exit to the outside. The potential difference now becomes +40mV. This state is called the depolarization state. The point of stimulation acts as a new stimulus for the next point and so on. The membrane sooner gains its permeability again and the positive charges return to the outside and the negative charges to inside. This state is called repolarization.

The nerve impulse reaches the synapse. There are some neurotransmitters that are excited by the nerve impulse coming and carry the message across the membrane. Some receptors receive theses neurotransmitters on the dendrites of the next neuron. These receptors act as a stimulus for the new cell.

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## A security fence encloses a rectangular area on one side of a park in a city. three sides of fencing are? used, since the fourth side of the area is formed by a building. the enclosed area measures 392392 square feet. exactly 5656 feet of fencing is used to fence in three sides of this rectangle. what are the possible dimensions that could have been used to construct this? area?

Answer:  The correct option is (C). 10 = square root of the quantity of x minus 8 all squared plus y minus 9 all squared

Step-by-step explanation:  Given that the segment AB has point A located at (8, 9). The distance from A to B is 10 units.

We are to select the correct option that could be used to calculate the coordinates for point B.

Let, (x, y) be the co-ordinates of point B.

According to distance formula, the distance between two points (a, b) and (c, d) is given by

Therefore, the distance between the points A(8, 9) and B(x, y) is given by

Since, distance between A and B is 10 units, so

d = 10.

Therefore,

Thus, the correct statement is

10 = square root of the quantity of x minus 8 all squared plus y minus 9 all squared.

Option (C) is correct.

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## Eight weeks after conception the embryo has formed almost all the basic organs true or false

The integumentary system covers the surface of the body is true about the integumentry system.

Explanation:

The integumentary system includes the skin, nails, glands, hairs, and nerves. Its main role is to act as a barrier to protect the body from the outside environment. It also retains body fluids, regulates body temperature, eliminates waste products, and protects against disease.

The integumentary system is the largest organ in the body that covers the surface of the body.

Thus, The integumentary system covers the surface of the body is the true statement about the integumentry system.

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## Which of these best describes an interest group? a group formed to support political campaigns financially a group that meets with lawmakers to influence legislation a group formed to influence government policy a group driven by the political interests of the community?

Making campaign contribution is a form of conventional participation. Conventional participation to a certain degree is a routine behavior that practices the well-established institutions of representative government most especially campaigning for candidates and voting elections. Conventional participation includes is voting, volunteering for a political campaign, making campaign donations, belonging to activist groups, serving in public office, displaying a campaign poster in the front yard and writing letters to public officials. For most people, involvement take place every few years at election time and people are strongly dedicated to politics are more to be expected to participate on a regular basis.

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## Using the side-splitter theorem, Daniel wrote a proportion for the segments formed by line segment DE. What is EC? 2 units 2.4 units 3 units 3.75 units

The basis to respond this question are:

1) Perpedicular lines form a 90° angle between them.

2) The product of the slopes of two any perpendicular lines is – 1.

So, from that basic knowledge you can analyze each option:

a.Lines s and t have slopes that are opposite reciprocals.

TRUE. Tha comes the number 2 basic condition for the perpendicular lines.

slope_1 * slope_2 = – 1 => slope_1 = – 1 / slope_2, which is what opposite reciprocals means.

b.Lines s and t have the same slope.

FALSE. We have already stated the the slopes are opposite reciprocals.

c.The product of the slopes of s and t is equal to -1

TRUE: that is one of the basic statements that you need to know and handle.

d.The lines have the same steepness.

FALSE: the slope is a measure of steepness, so they have different steepness.

e.The lines have different y intercepts.

FALSE: the y intercepts may be equal or different. For example y = x + 2 and y = -x + 2 are perpendicular and both have the same y intercept, 2.

f.The lines never intersect.

FALSE: perpendicular lines always intersept (in a 90° angle).

g.The intersection of s and t forms right angle.

TRUE: right angle = 90°.

h.If the slope of s is 6, the slope of t is -6

FALSE. – 6 is not the opposite reciprocal of 6. The opposite reciprocal of 6 is – 1/6.

So, the right choices are a, c and g.

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## Use this map to answer the following question: Based on the map, the east border of the Mauryan Empire was formed by which of the following? Bay of Bengal Arabian Sea Himalaya Mountains Hindu Kush

The correct answer is B. Between 1820 and 1850, most Irish immigrants settled in cities on the East Coast.

After 1840, the majority of Irish Catholic immigrants headed for the big cities or the industrial towns of the East Coast, to cities like Boston, New York, Philadelphia, Pittsburg, Baltimore, Detroit or Chicago.

It is estimated that 12% of the total population of the United States of America have Irish ancestry, being Irish Americans the second largest ethnic group of European descent after the German Americans.

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## The karst topography is formed by the actions of

The karst topography is formed by the actions of

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## An oceanographer discovered new seafloor being formed in the ocean at a divergent fault. The scientist classifies this as a trench. Is the scientist correct or incorrect and why or why not?

The scientist is incorrect in his statement.

The new seafloor is formed at places where there’s divergent plate boundaries. Because the two or more plates are moving away from one another, the crust becomes thinner, so the high temperatures, pressures, and magma manage to penetrate from the mantle very easily. The magma that comes out on the surface is cooling off very quickly and is creating igneous rocks, thus new crust, or new seafloor if you will.

The trenches are appearing at places of convergent plate boundaries, and they are not places where new seafloor is formed, but rather places where one tectonic plate submerges under another tectonic plate.

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## A trapezoid has two right angles and bases that measure 16m and 8m. The right triangle formed by an altitude has a hypotenuse of 4 square root 5m. Sketch the trapezoid. What are its perimeter and area?

Answer:  The correct option is (C). 10 = square root of the quantity of x minus 8 all squared plus y minus 9 all squared

Step-by-step explanation:  Given that the segment AB has point A located at (8, 9). The distance from A to B is 10 units.

We are to select the correct option that could be used to calculate the coordinates for point B.

Let, (x, y) be the co-ordinates of point B.

According to distance formula, the distance between two points (a, b) and (c, d) is given by

Therefore, the distance between the points A(8, 9) and B(x, y) is given by

Since, distance between A and B is 10 units, so

d = 10.

Therefore,

Thus, the correct statement is

10 = square root of the quantity of x minus 8 all squared plus y minus 9 all squared.

Option (C) is correct.