Which body of water is most likely to be a marine ecosystem? A. Lake
B. Estuary
C. Pond
D. River

Which of the following best describes the purpose of technology?

In what for do plants utilize nitrogen? why do they need nitrogen?

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.