D because kg is mass and cubic cm is volume which Density = Mass / Volume
Answer:
reproduction
I am typing this part because it wouldn't let me submit because I didn't have enough written
The theory would be endosymbiont theory. It was developed on the idea that some eukaryotic organelles come from prokaryotic organisms. It is also known as symbiogenesis. This theory says that these organelles were first from prokaryotic cells that is living inside a host cell.
