Although efforts were made to protect the western black rhinoceros, it is thought that man has directly caused its extinction by a) capturing the animal for circuses and zoos. b) hunting and poaching the animal for its horn. c) logging and mining throughout the rhino's habitat. d) increased carbon dioxide levels and global warming.

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.