Higher metabolic rates during growth and development periods like adolescence and pregnancy are due to:

a. longer periods of rest

b. getting older

c. rapid bodily changes

d. the amount of food consumed

Two of the characteristics of all living things are 1) growth and development (as seen in adolescents and pregnancy) and 2) maintaining homeostasis - - - to maintain homeostasis during these periods of rapid growth and development, metabolism must be upkept as well. They are all related.