Categories
Assignment Help

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

[ad_1]

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.

[ad_2]

Categories
Assignment Help

What is thought to be true about the three domains of living things? A. They diverged from a common ancestor before the evolution of the main groups of eukaryotes. B. They diverged from a common ancestor fairly recently. C. They did not have a common ancestor. D. Domains Bacteria and Archaea evolved after the main groups of eukaryotes.

[ad_1]

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.

[ad_2]

Categories
Assignment Help

According to the theory of _____, today’s organisms evolved from past organisms.

[ad_1]

Answer:

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.

[ad_2]

Categories
Assignment Help

Describe how attitudes toward equality evolved during colonial era

[ad_1]

Describe how attitudes toward equality evolved during colonial era

[ad_2]

Categories
Assignment Help

He idea that offspring inherit traits that their parents acquired by interacting with the environment, like the longs necks of giraffes having evolved to help them reach tall branches, was championed by

[ad_1]

The right answer is D.

Meiosis consists of two successive cell divisions that will give birth to gametes.

After the meiosis, the original cell gave birth to four haploid cells whose genomes were recombined in a unique way.

In humans, the cells that will participate in meiosis are spermatocytes and oocytes.

In the cells that will enter into meiosis, the replication of A.D.N. occurred during interphase, each chromosome consists of 2 chromatids connected by their centromere. (Each chromatide is formed of a double-stranded A.D.N molecule and molecules that maintain its structure)

[ad_2]

Categories
Assignment Help

In the video for this lab we discussed the evolution of cheetahs. cheetahs evolved to be faster because faster individuals could catch the gazelles. how do you think the population of gazelles evolved while the cheetahs were evolving to be faster? explain how this evolution would have occurred.

[ad_1]

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.

[ad_2]

Categories
Assignment Help

In comparing the streamlined nature of a dolphin and that of a shark, you conclude that the streamline feature evolved independently in sharks and dolphins. this common characteristic most likely is the result of:

[ad_1]

In comparing the streamlined nature of a dolphin and that of a shark, you conclude that the streamline feature evolved independently in sharks and dolphins. this common characteristic most likely is the result of:

[ad_2]

Categories
Assignment Help

Select all answers that apply. Which of the following statements depend on the relative dating of events? Amphibians evolved before land reptiles. Bony fish first evolved about 420 million years ago. The Jurassic period began 200 million years ago. Elephants appear in the fossil record after dinosaurs became extinct

[ad_1]

The correct answer is – B. Tropical climates have four distinct seasons.

The tropical climates are climates where it is summer throughout the whole year. The temperature is high and they receive large amounts of precipitation. While some receive precipitation throughout the whole year, usually in the afternoon hours, some have it seasonally, where they experience a wet season and a dry season, which are the only two seasons that appear in certain tropical climates.

Because of this, the tropical climates have the biggest diversity in both flora and fauna. The forests are thick and always green, and the animals of all sorts and sizes are in abundance.

[ad_2]

Categories
Assignment Help

Why are mitochondria thought to have evolved from very early simple bacteria?

[ad_1]
Why are mitochondria thought to have evolved from very early simple bacteria?
[ad_2]

Categories
Assignment Help

The first organisms evolved on Earth around 4 billion years ago. The fossil record indicates that the first organisms were which of the following?

[ad_1]

The correct answer is B. Move through abiotic and biotic regions

Explanation:

The biogeochemical cycles refer to different natural cycles such as the oxygen cycle, the water cycle or the sulfur cycle that guarantee different substances and elements that are essential for life and Earth move. Indeed substances in biogeochemical cycles travel through abiotic or non-living regions such as the atmosphere or the soil but also involve biotic ones including ecosystem, animals, and plants. According to this, biogeochemical cycles move through abiotic and biotic regions.

[ad_2]

Categories
Assignment Help

After the last major ice age, sea levels around the world rose. As they did, the rising waters divided what was once a single island in the North Sea into two different islands. A population of rabbits was split between the two islands. Ten thousand years passed with no contact between the two rabbit groups. In recent times, a scientist attempted to breed individuals from the two groups, but he was unsuccessful in doing so. Why were rabbits from the two groups unable to produce offspring together? A.The groups belonged to different breeds of rabbits. B.The groups were adapted to very different climates. C.The groups had evolved into separate species. D.The groups were not able to recognize each other.

[ad_1]

a. (+4, -2)

We can use the following conventions:

– x-axis: east-west direction, with east being positive x and west being negative x

– y-axis: north-south direction, with north being positive y and south being negative y

With this coordinates, the movie theater is:

– 4 km east –> this means x = +4

– 2 km south –> this means y = -2

So, the coordinates of the theater are (+4,-2)

b. (-1,+1)

We drive 5 km west (which means Delta x = -5) and 3 km north (which means Delta y = +3). We have to add these displacements to each coordinate. we find:

x'= x_0 + Delta x = +4 + (-5) = -1\y' = y_0 + Delta y = -2 + (+3)=+1

So, the coordinates of the restaurant are (-1, +1)

[ad_2]