Which statement best describes a keystone species? O A. It is the largest population in the community.
B. It occupies the highest trophic level in the
community
C. Its absence would affect many organisms in the
community.
O D. It is the largest animal in the community.

Which of the following is true of metabolism in its entirety in all organisms? a) metabolism depends on a constant supply of energy from food. b) metabolism uses all of an organism's resources. c) metabolism consists of all the energy transformation reactions in an organism. d) metabolism manages the increase of entropy in an organism.