C. both animals and plants have changed over time
<span>The endosymbiotic theory designates how a large host
cell and consumed bacteria could simply become dependent on one different
for survival, thus resulting in a permanent relationship. The explanation behind
the origin of the two mitochondrial membranes is the inner membrane was derived
from folding of the prokaryotic plasma membrane and the outer from folding in
of the eukaryotic plasma membrane.</span>
