Are there more adults(18 or over) than kids in this world?

Which of the following is the best definition of aerobic respiration? o a. the cellular process that releases energy by breaking down glucose o b. physical activity that involves the repeated motion of large muscle groups o c. physical activity that increases heart rate and breathing rate o d. the cellular process that converts solar energy to chemical energy

Can someone i have no idea of how to do this.

How does the carbon cycle involve an exchange of carbon