Which of the following best describes respiration?
Select one:
A. It is the breakdown of large insoluble food molecules into small water-soluble
food molecules so that they can be absorbed into the watery blood plasma.
B. It is the gas exchange between the body and the external environment.
C. It is the process in which metabolic waste is eliminated from an organism.
D. It is the process in which metabolic waste is eliminated from an organism.