Answer Happy

18. Under ideal conditions, a species of bacteria can grow and divide every 30 minutes. After 2 hours, how many bacteria cells will there be if the population begins with a single cell that reproduces at its full potential and if all the bacteria survive? a. 6 b. 7 c. 16 d. 32 e. 64 19. Which organisms act as the decomposers in most communities? a. animals b. bacteria c. fungi d. plants 20. If two species in a community require very similar resources, what would you expect to occur? a. The carrying capacity of the environment for both species will be lower. b. The more similar the requirements of the two species, the more intense their competition will be to gain resources. c. The two species will evolve the ability to interbreed and will hybridize to form a new species that does not compete. d. A mutualistic interaction will develop between the two species so they cooperate to survivie together. e. The less competitive species will become a parasite on the more competitive species. 21. Nights are often cool in deserts because a. all the available heat is absorbed during the day b. the dry air doesn't hold the heat it absorbs during the day c. the scattered plants spread the heat out over a wide area 22. The growth curve of a population under ideal conditions resembles the letter: a. J b. K c. R d. S 5