What is phosphorus? A. a chemical that kills plants and animals that come in contact with it
B. a chemical that kills insects that are harmful to plants
C. a chemical that plants and animals need to survive
D. a chemical that prevents rocks from eroding

2. which is the last step in the scientific method?

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

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.