If i was taking a test about evolution in biology what are the most important and most common things that will be on this test?

At which location in earth’s interior does the top density continue to increase as thickness decreases?

All eukaryotic cells contain small bodies called

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of