What is an important characteristic of an index fossil?
O A. It must not be extinct.
O B. It must have been very large.
O C. It must have lived in a very specific geographic
region.
O
D. It must have lived for a short geologic period of time.

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.