3 years ago

How do biologists model changes in a population?

Biology

1 answer:

dimaraw [331]3 years ago

3 0

Explanation:

It changes to improve more because humans are so popular in the world.

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Explain how nerves signal muscles fibers to contrast?

laila [671]

Answer:

By action potential nerve contract the muscle

Explanation:

The muscle contract when the nervous system sends action potential to the muscle. So the nervous system delivers signal to muscle, the first signal reaches the neuromuscular junction. The signals are passed by a chemical messenger called neurotransmitter release by motor neurons, the chemicals bring reaction and shorten the muscle fibre. When neurotransmitter are absent or reduce in concentration the process reverse and muscle relax again.

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3 years ago

Why can humans not see ultraviolet (UV) light?

SVEN [57.7K]

Answer:

Most humans cannot see ultraviolet light because it has a smaller wavelength than violet light, putting it outside of the visible spectrum.

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