Evolution and Fossils

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When they die, parts of the animal don't decay easily. collects around the dead animals and they become buried.
The sediment surrounding the animal remains also turns to , but the fossil stays distinct inside the rock.
Over a long period of time the hard parts and are replaced by minerals. A hard rock-like substance is formed in the same as the original hard part known as a fossil.
Fossils formed in this way usually develop from hard parts of animals such as shells, teeth and bones.
Scientists can look at the small that have happened to of animals over long periods of time by examining the fossils. They can see how one animal has changed. This is for the theory of evolution.