If a trait varies greatly within a pair of identical twins, it is mostly caused by what?

genetics

environment

nutrition

inherited

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

Could someone me with number one you

In general, are there any major differences that you can see? explain