How do predator & prey populations interact with each other? (in terms of population size.)

What is thought to have caused the mass extinction at the end of the cretaceous period?

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin

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.