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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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Jul 17, 2019
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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
Biology
middle-school
GrandOpener
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Letter A for sure! Hope I helped.
Bsalex
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Jul 18, 2019
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Bsalex
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its D, i looked it up
Santosh B
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Jul 24, 2019
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Santosh B
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