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Ostrovityanka [42]
3 years ago
10

Hair is made from a

Biology
1 answer:
fomenos3 years ago
8 0

Answer:

The answer is d

Explanation:

keratin is a protein molecule that is found in hair follicles fingernails and in some skin cells.

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The action potential spreads through an axon by Group of answer choices depolarizing adjacent membrane to threshold, triggering
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The action potential spreads through an axon by depolarizing adjacent membrane to threshold.

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learn more about action potential here: brainly.com/question/6705448

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