The obvious answer is a bc it does not use and toxic fuels
The Cretaceous–Paleogene (K–Pg) extinction event (also known as the Cretaceous–Tertiary (K–T) extinction) was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago.
Variation means difference in genetic makeup between individuals within a specie.
Ribosomes although the mitochondria is similar its ribosomes.
