Fossils and evidence

Evidence for evolution - fossils Fossils of ammonites - sea creatures that became extinct about 65 million years agoMost of the evidence for evolution comes from the fossil record. Fossils show how much, or how little, organisms have changed over time. One of the problems with the fossil record is that it contains gaps. Not all organisms fossilise well, and there will be many fossils that have been destroyed by the movements of the Earth, or simply not yet been discovered.