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## The fossil record clearly shows that ________. the fossil record clearly shows that ________. large complex organisms evolved long before simple. nearly all species that have existed in the past still exist today. all species evolve from pre-existing species. new species appear suddenly and fully differentiated, without an ancestral species. several different species can hybridize to produce a single new species

### Answered by answersmine AT 22/10/2019 – 02:35 AM

I think the answer is all species evolve from pre-existing species. This was based on Charles Darwin’s Theory of Evolution which he learned during his expeditions.He identified that some fossils have similarities with other existing animals, in which he believed were a part of adaptation in order to survive.

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## The molecular clock has been useful to determine the phylogenetic relationships of species based on the assumption that:

The molecular clock has been useful to determine the phylogenetic relationships of species based on the assumption that:

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## What does it mean to adapt to a new climate? A. to leave one climate and travel to another B. to change behaviors in order to meet a climate’s challenges C. to change from one species to another because of the climate D. to go a long period of time without rain in a climate

What does it mean to adapt to a new climate? A. to leave one climate and travel to another B. to change behaviors in order to meet a climate’s challenges C. to change from one species to another because of the climate D. to go a long period of time without rain in a climate

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## In Texas, the population of a species of bats is decreasing at a rate of -0.121 per year. The population was 34,000 in 2000. According to the function; A(t) = A0e^(kt), what is the predicted population in 2015?

Population of bats in year 2015 is 5536.

Step-by-step explanation:

The given function A(t) = predicts the population of bats after t years.

Here A(t) = population after ‘t’ years

k  = growth constant

t = time in years

= initial population

In year 2000 population of bats A(t) = 34,000

Since rate of decrease in population k = 0.121 per year

So population in 2015 will be

A(t)

= 34,000 [ ]

= 34,000 ( 0.162837)

= 5536 bats

Therefore, population of bats in year 2015 is 5536.

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## Which is a good example of adaptive evolution? The red fox that inhabits farmlands and forests has a red coat, but its relative, the kit fox, lives in a desert has a sandy–colored coat. Two birds of the same species separate during their migratory flight. After several years, their descendants are quite different from each other. Two species of fish try to swim against the current near a waterfall. One survives, but the other doesn't.

Which is a good example of adaptive evolution? The red fox that inhabits farmlands and forests has a red coat, but its relative, the kit fox, lives in a desert has a sandy–colored coat. Two birds of the same species separate during their migratory flight. After several years, their descendants are quite different from each other. Two species of fish try to swim against the current near a waterfall. One survives, but the other doesn’t.

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## Which principle states that two species in the same habitat cannot have the same niche? niche exclusion principle competitive exclusion principle habitat exclusion principle population exclusion principle

Answer: competitive exclusion principle

The competitive exclusion principle suggests that no two species can occupy the same ecological niche (functional role an organism performs in an ecosystem like type of food, and habitat chosen for living) in the ecosystem, the one which is stronger and superior over the other is likely to derive the resources and exhibit better chances of survival.

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## Which chromosome is the sex determiner for many species

Which chromosome is the sex determiner for many species

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## Anonymous 5 years ago A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 5 million years. How many years ago did two species share a common ancestor if the molecules found in these two species differ by a total of eight mutations? Answer a) 1.5 million years b) 10 million years c) 20 million years d) 40 million years

Anonymous 5 years ago A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 5 million years. How many years ago did two species share a common ancestor if the molecules found in these two species differ by a total of eight mutations? Answer a) 1.5 million years b) 10 million years c) 20 million years d) 40 million years

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## Two different species in the same ecosystem can share a _____. population habitat carrying capacity niche

Two different species in the same ecosystem can share a _____. population habitat carrying capacity niche

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## Which of the following is an example of microevolution? A caterpillar changes form into a butterfly. A population of birds slowly changes feather color from red to blue. A dinosaur species evolves over time into a bird species. A black cat has kittens with white spots.

Which of the following is an example of microevolution? A caterpillar changes form into a butterfly. A population of birds slowly changes feather color from red to blue. A dinosaur species evolves over time into a bird species. A black cat has kittens with white spots.

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## Which of the following is not true about the distribution of species? a. A species’ native range does not include areas where it was introduced by humans. b. Some species have a range they inhabit only for breeding. c. Seasonal ranges include areas where species are found for part of the year. d. All the organisms in an ecosystem share distribution patterns.

d. All the organisms in an ecosystem share distribution patterns.

Explanation:

Native range is what is known in biology as the areas where a species is naturally found, not places were humans introduced them, species have some range only for breeding, for example some frogs only go into the rapids for breeding, and not for living or hunting, and seasonal ranges are areas where the species are found for a part of the year, for example the butterflies that migrate south to Mexico on the coldest months of the year and then come back to the United States for the warm summer, the only one that is not true is that all the organisms in an ecosystem share distribution patterns.

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## What is a biological control for pest management? a. some members of the pest population are sterilized b. sexual attractants lure pest species to traps c. predators, parasites, or disease organisms are released to reduce pest populations d. harvested foods are exposed to ionizing radiation e. genetic engineering develops pest-resistant crops?

What is a biological control for pest management? a. some members of the pest population are sterilized b. sexual attractants lure pest species to traps c. predators, parasites, or disease organisms are released to reduce pest populations d. harvested foods are exposed to ionizing radiation e. genetic engineering develops pest-resistant crops?

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## What do biologists use to establish whether or not two organisms are of the same species

What do biologists use to establish whether or not two organisms are of the same species

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## Which of the following best describes a species? a group of closely related organisms that can produce viable or fertile offspring a group of closely related organisms that can NOT produce viable/fertile offspring a group of closely related organisms that cannot produce any offspring a group of distantly related organisms that can produce infertile offspring

Which of the following best describes a species? a group of closely related organisms that can produce viable or fertile offspring a group of closely related organisms that can NOT produce viable/fertile offspring a group of closely related organisms that cannot produce any offspring a group of distantly related organisms that can produce infertile offspring

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## Variation of ecological habitats within a species is characteristic of which type of diversity?

The blood type is B+. The blood type depends on some protein substances called antigens present on the cell membrane of the red blood cells that help the cells to identify and communicate with each other. There are four types of blood types;
1- Blood type A which have antigens A on the red blood cells.
2- Blood type B which have antigens B on the red blood cells.
3- Blood type AB which has antigens A and B on the red blood cells.
4- Blood type O which have no antigens on the red blood cells.
There is a second type of antigens present on the red blood cells which is called rhesus. Rhesus may be present, so the individual will be positive (+) rhesus), or it may be absent, so the individual will be negative (-) rhesus.
To determine the blood type, we add anti-a and anti-b serums to two samples of the tested blood.
If the anti-a coagulates only, the person is blood type A.
If the anti-b coagulates only, the person is blood type B.
If the two samples coagulate, the person is blood type AB.
If the two samples don’t coagulate, the person is blood type O.
To another blood sample from the same blood, we add anti rhesus, if it coagulates, the person is )+), if not the person is (-).

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## PLEASE help, im confused . Here is the question, You have been asked to write a paper on endangered species. In a paragraph of at least six sentences, describe the steps you will take to conduct your research. thank you on advance

Hey there!

Correct answer is D. Comma or Period Inside Rule

A. Question mark or exclamation point inside: those are not really necessary.

B. Colon or semicolon: not, a semicolon would divide the whole sentence and it would be shorten; a colon would work but after requested, when there is already a comma.

C. Question mark or Exclamation Point Outside Rule: would not work, becase it is an very polite and affirmative sentence.

D: A comma or period inside rule: actually, just a comma would work. Please, Cooper’s dad requested, go… Cooper’s dad requested must be in between commas as it is a vocative.

Hope this helps

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## MULTIPLE CHOICE VERY EASY!!!!! Which statement about the members of a population that live long enough to reproduce is consistent with the theory of evolution by natural selection? A. They are the ones that are best adapted to survive in their environment. B. They will perpetuate unfavorable changes in the species. C. They transmit characteristics acquired by use and disuse to their offspring. D. They tend to produce fewer offspring than others in the population.

In tropical rain forest, the animals will have to deal with higher temperatures and greater rainfall. One example of an adaptation they might need is a thin, water-proof coat. This will prevent heat from becoming trapped inside their fur/hair/feathers, and the water-absorbing coating will allow water to stick to the inside of the coat without being absorbed, where the water will absorb the heat instead of themselves, and will cool the through evaporative cooling (heat release through evaporation)

In a deciduous forest, there is much colder temperatures, and significantly less rainfall. These animals would likely want a thicker water-proof coat. This is because the thicker coat would allow heat to become trapped, keeping them warm in the winter, and the water-proof coating prevents water from freezing in their fur, making them colder.

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## WORTH 15 FOR 2 EASY QUESTIONS MULTIPLE CHOICE SECOND QUESTIONS EVEN EASIER THAN THE FIRST IM PRETTY SURE THE ANSWER IS C JUST CHECKING Which of the following conditions would likely prevent the assembly and survival of new kinds of organic molecules on Earth today? A. the presence of bacteria and other life forms B. the presence of carbon dioxide C. the supply of atoms that serve as raw material D. the light and warmth from the sun 2. Several different species make up a A. family. B. genus. C. kingdom. D. phylum.

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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## WORTH 25 POINTS PLEASE ANWNSER AND DONT GUESS Fossils of the coelocanth, a primitive fish, date back about 140 million years. Modern coelacanths are virtually identical to their fossil ancestors. This species most likely evolves through the process of A. convergent evolution. B. punctuated equilibrium. C. coevolution. D. gradualism.

WORTH 25 POINTS PLEASE ANWNSER AND DONT GUESS Fossils of the coelocanth, a primitive fish, date back about 140 million years. Modern coelacanths are virtually identical to their fossil ancestors. This species most likely evolves through the process of A. convergent evolution. B. punctuated equilibrium. C. coevolution. D. gradualism.

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## Charles Darwin’s theory of evolution by natural selection explains each of the following EXCEPT how A. evolution takes place in the natural world. B. species can become extinct. C. species descend from common ancestors. D. inherited traits are passed from parent to offspring.

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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## What percentage of fish species live in freshwater ecosystems? A. 30% B. 40% C. 45% D. 35%

What percentage of fish species live in freshwater ecosystems? A. 30% B. 40% C. 45% D. 35%

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## Which of the following levels of organization is the smallest? Kingdom Species Family Genus

Which of the following levels of organization is the smallest? Kingdom Species Family Genus

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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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## The rate (in mg carbon/m3/h) at which photosynthesis takes place for a species of phytoplankton is modeled by the function p = 120i i2 + i + 9 where i is the light intensity (measured in thousands of foot-candles). for what light intensity is p a maximum?

The given function is:

P = 120 i / (i^2 + i + 9)

or

P = 120 i (i^2 + i + 9)^-1

The maxima point is obtained by taking the 1st
derivative of the function then equating dP / di = 0:

dP / di = 120 (i^2
+ i + 9)^-1 + (-1) 120 i (i^2 + i + 9)^-2 (2i + 1)

setting dP / di =0 and multiplying whole equation by (i^2
+ i + 9)^2:

0 = 120 (i^2 + i + 9) – 120i (2i + 1)

Dividing further by 120 will yield:

i^2 + i + 9 – 2i^2 – i = 0

-i^2 + 9 =0

i^2 = 9

i = 3      (ANSWER)

Therefore P is a maximum when i = 3

Checking:

P = 120 * 3 / (3^2 + 3 + 9)

P = 17.14