If the first living things were autotrophs, they
A. would have used organic molecules as a source of energy.
B. would have engaged in photosynthesis.
C. would have engaged in chemosynthesis.
D. All of these answers are true.
C. would have engaged in chemosynthesis.
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The correlation between X and Y holding at least one other variable constant is known as:
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Allele that exerts its phenotypic effect only in the homozygote; its expression is masked by a dominant allele.
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