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