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OpenStudy (anonymous):
Which of the following cycles is crucial to living organisms? a. phosphorus b. water c. carbon d. all of the above i think it is C, but not sure.
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OpenStudy (anonymous):
also, help on this one. i think it is A. Phosphorus plays an important role within the structures of the body. Which of the following structures is phosphorus found in? a. bones b. cell membranes c. DNA d. all of the above
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