Which ideas are part of the cell theory? Check all that apply.

A. All living things are made of cells.
B. All nonliving things are made of cells.
C. Cells come from nonliving things.
D. Cells come from other cells.
E. Only unicellular organisms are made of cells.
F. Cells are the smallest living part of a living thing.
G. Cells function to keep the cell, and the organism, alive.