Desalination is needed in order to obtain potable water from

a. aquifers

b. glaciers

c. lakes

d. oceans

Diagram of the evolution of land plants?

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

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.