True or falce in a particular envionment two species can usually occupy the same niche

Which of the follow describes a disadvantage secondary sources have compared to primary sources?

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.

Abacteriophage typically attaches to the bacterium and then