common descent means the evolutionary in biology and how they have something linked with their common ancestors.
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not sure but I think it's option C.
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Becuase in canada here it snows and yeah.
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Answer Internal and external environmental factors, like gender and temperature, influence gene expression. ... Similarly, drugs, chemicals, temperature, and light are among the external environmental factors that can determine which genes are turned on and off, thereby influencing the way an organism develops and functions.
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