AP BIOLOGY

Detailed explanation-1: -Fossils are the preserved remains or traces of animals, plants, and other organisms from the past. Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today.

Detailed explanation-2: -A fossil that shows an intermediate state between an ancestral trait and that of its later descendants is said to bear a transitional feature. The fossil record includes many examples of transitional features, providing an abundance of evidence for evolutionary change over time.

Detailed explanation-3: -A key way to establish the fact of evolution is through the use of transitional forms. Transitional forms show intermediary steps between one species and another through geologic time, preserving the steps in the actual process of evolution through fossils.

Detailed explanation-4: -Evidence in the form of the fossil record, geological formations, and genetics attest to change having taken place and give clues to how evolution works. The theory of evolution puts these clues together into a cohesive explanation of the diversity of living things.