Fossils are the preserved traces or remains of organisms that lived millions of years ago

all tissue in the body will fossilise

Whale flippers have the same structure to their limbs

fossils do not always form

many fossils are yet to be found

The fossil record in rocks gives us evidence of what the living organisms were like and how they changed over time.

The fossil record is complete

Differences of limbs can not be explained

Evidence suggests that the human and the whale shared an ancestor