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When an animal runs along the ground by flexing some of its muscles, what causes its muscles to contract? A. hormonal signals B. light signals C. heat impulses D. electrical impulses
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4 votes
When an animal runs along the ground by flexing some of its muscles, what causes its muscles to contract?

A.
hormonal signals
B.
light signals
C.
heat impulses
D.
electrical impulses

User GrandOpener
by
5.7k points

2 Answers

3 votes
Letter A for sure! Hope I helped.
User Bsalex
by
5.1k points
4 votes
its D, i looked it up
User Santosh B
by
5.6k points
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