What is cell theory? A)That life is spontaneous b)That life comes only from air
C)That life comes only from existing cells
D)Life is the result of metamorphosis

C

Explanation: In biology, cell theory is a scientific theory first formulated in the mid-nineteenth century, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. Cells are the basic unit of structure in all organisms and also the basic unit of reproduction.