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What is the importantence of the carbon and nitretan cycles in the environment

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?

In trying to determine whether dna or protein is the genetic material, hershey and chase made use of which of the following facts? a) dna contains sulfur, whereas protein does not. b) dna contains phosphorus, whereas protein does not. c) dna contains nitrogen, whereas protein does not. d) dna contains purines, whereas protein includes pyrimidines.