Which example best describes one way that humans contribute to the water cycle? a. formation of genetic material b. evaporation of sweat from skin c. production of oxygen d. fixation of nitrogen into ammonia

Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.

Most of the carbon on earth is stored in the form of

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca