The primary function of the Calvin cycle is to change carbon dioxide into usable energy known as glucose. So Option A.
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Answer:
C. neither A nor B is true
Explanation:
B. is incorrect because the closer the branch point is to an organism, the more related those organisms are. So that eliminates D. A. is incorrect because the correct chart for ancient organism evolution is called a Phylogenetic tree. So that only leaves C as your answer.
..........Proteins..........