Biology answers many questions, but its main focus

a. how living organisms interact and function.
b. how people and animals interact and live.
c. the animals of the earth and their environment.
d. the history of life on earth.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.