What controls when and how fast cells grow and divide?

This group of organisms perform the process of ammonifcation. a. herbivores b. decomposers c. carnivores c. plants

How energy move through ecosystem ?

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems