B. specific to a substrate
Genotype is not the only thing that effect phenotype because you have environment effects as well that can cause a vary of things.....
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you are using your shoulder muscle. The reason you are using this muscle is when you put your arm strait up there is no reason to use a bicep or tricep muscle.
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alcohol is the answer i think
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Since life on Earth predates photosynthesis, the exploration of this deep-water environment that lacks any source of light could provide information on what those life forms looked like.
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