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2 years ago

Evolution is the

Biology

1 answer:

lina2011 [118]2 years ago

5 0

Answer:

Evolution is the biological process that happens over time in a population, giving rise to new species. The theory of evolution states that all organisms alive on Earth today have a common ancestor which lived years ago.

Explanation:

Evolution is one of the fundamental reason of diverse life on Earth today. Principally, this process takes place by changes in genetic elements via mutations and crossing-over. The positive changes (mutations) allow the organism to develop better condition in order to survive in changing environmment. However, if the changes takes place at major scale, it also leads to the creation/development of new species. To explain this further, I have added a photograph where we can see how different organisms were evolved in the history of Earth.

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What is the mass of an element with 15 protons, 13 electrons, and 11 neutrons?

RSB [31]

Answer:

B. 26amu

Explanation:

The nucleus of an atom in an element contains protons, electrons and neutrons. The proton number equals the electron number in a neutral atom. The proton number is also called the atomic number, denoted by Z.

The mass number also called Atomic mass unit (amu) in this case, of an element is the sum of the proton number and the neutron number in the atom of that element. The mass number is denoted by A.

Hence, A = Z + N

Where A = Mass number

Z = Proton (atomic number)

N = Neutron number

In this question, N is 11 while Z is 15

Hence, the mass number of the element in the question, in AMU, is 15 + 11 = 26amu.

8 0

3 years ago

What kind of channels are located in the input region?

tamaranim1 [39]

Answer:

The correct answer is option B ( ligand gated channels opened by neurotransmitter molecules).

Explanation:

Input region or postsynaptic region or dendrite is the site of neuron cell which receives the impulse from the pre-synaptic neuron at the synaptic junction.

The cell membrane of the dendrite is embedded with ligand-gated channels which opens up in response to the ligand (neurotransmitters) produced by the neurotransmitter vesicle of axon or output region of neuron.

The neuromuscular junction is such a case where acetylcholine receptors present in the dendrite opens in the presence of acetylcholine.

Thus, option B ( ligand-gated channels opened by neurotransmitter molecules) is the correct option.

8 0

2 years ago

The Mesozoic era was the “Age of Reptiles.” At the end of the Mesozoic era, many groups of animals disappeared suddenly. Scienti

Savatey [412]

A large asteroid or comet impacted the earth.

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2 years ago

Name one product of digestion which is not absorbed directly into the blood stream

marishachu [46]

Answer:

ion

Explanation:

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2 years ago

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A scientist is examining a simple multicellular organism with a nucleus and

Sphinxa [80]

Answer:

The answer is protista.

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3 years ago