Because natural selection is caused so that an organism can adapt and better survive their environment. They are involved in the formation of fossils because organisms that die are buried in sediment and become fossils.
The correct answer is ... B) a nucleus. DNA is found, tightly coiled in chromosomes in the nucleus.
Un what's even the question so that I can help you get the answer???
Mammals
just like us humans. have backbone, lungs, and reproduce on land
