Evolution and natural selection (Evidence for evolution (Fossils (Shows…
Evolution and natural selection
The Theory of Evolution: All of today's species have evolved from simple life forms that first started to developed over three billion years ago.
Evidence for evolution
Shows that some species are related to other species that went extinct
Species share the same features
DNA is similar in different species
Is how an organism becomes better adapted to their habitat which makes them more likely to survive, therefore more likely to reproduce and have offspring with the same trait.
Speciation occurs when two groups of the same species become so different due to natural selection that cannot reproduce with each other
Where the gene is changed, which causes a variant that is passed down through generation
This can be caused by:
Exposure to radiation
Exposure to chemicals