Speciation
Fossils provide evidence that animals and plants change over long periods of time.
Bone and shells do not decay as easily.
Dead organisms can be preserved in amber, peat logs , tar pits or in ice
Casts and impressions such as foot prints gets covered by layers of sediment which becomes rock.
Simplier organisms are found at the oldest rocks
This supports the theory of evolution
Extinction
When individuals are poorly adapted to the environment they are less likely to survive and reproduce so they don't pass on the genes. If a species are poorly adapted the will become extinct as they will not survive.
Factors that can cause extinction
New disease
New predator
New competitor
Change to climate
Catastrophic event.
Isolation is when 2 population of species become geographically separated over time they become more adapted to their different environment and makes characteristics different.
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