Question

according to the cell theory, all cells come from.
a an adaptation.
b a common ancestor.
c pre - existing cells.
d a protocell.
e endosymbiosis.

Explanation:

One of the tenets of the cell - theory is that all cells come from pre - existing cells. This is a fundamental concept in biology, stating that new cells are produced through cell division of existing cells.

Answer:

C. pre - existing cells