Life on Earth Revision. Variation of Life on Earth. All living things, both those alive and those that are now extinct all originate from the simple living things that first appeared 3500 million years ago. Evidence for evolution comes from: Fossils DNA testing. Natural Selection.
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Increased chance of survival
Increases numbers in population
Selecting individuals with desired features
Selecting offspring with desired features
Increasing numbers with desired features
(See Brain and Mind)