Pick your answer from:
[a]. contraction.
[b]. Energy.
[c]. sensory neurons.
[d]. looseness.
[e]. Chemical energy.
[f]. Vibrates.
[g]. fur and fat.
[h]. layers of fat.
Q: Fact 1: Muscles can only contract. Fact 2: Bones work with muscles to perform movement. Given the two facts above, what enables bones to perform movement?
A:
[a].