B. The existence of homologous structures
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I'm thinking the answer is Carbohydrate. So the answer would be option A.
please post the understandable question
The vast majority of a tree's carbon comes from the air, which averages 0.03-0.04% by volume (300-400 ppmv) CO2. This is fixed through photosynthesis and eventually stored as glucose which the plant can then use for its metabolism.
B>encodes the genetic message for the synthesis of new proteins<span>
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