need answer asap. as children grow older, their bones grow too. the growth of the long bones happens in a plate near the end of each bone. what happens to the cells of cartilage in a growth plate? a. cartilage cells are replaced by bone cells. b. cartilage cells lengthen to stretch out the bone. c. cartilage cells expand and become spongy bone cells. d. cartilage cells move into spongy bone as bone marrow.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

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.