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Zinaida [17]
3 years ago
5

When an animal runs along the ground by flexing some of its muscles, what causes its muscles to contract?

Biology
2 answers:
ira [324]3 years ago
8 0
Letter A for sure! Hope I helped.
dalvyx [7]3 years ago
7 0
Its D, i looked it up
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Link to the picture of the diagram below...:

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Please answer fast !
swat32
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hope i helped :D
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