Some types of algae live inside coral. the algae provide the coral with nutrients. the coral provides the algae with shelter. which of the following relationships exist between the algae and coral?
a. a competitive relationship
b. a symbiotic relationship
c. a parasite-host relationship
d. a predator-prey relationship

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.