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Speciation and Evolution.
How does speciation occur?
For speciation to occur there must be reproductive isolation. Geographical isolation and natural
selection lead to reproductive isolation. Random mutations cause variation between members of the
same species, and through natural selection this can cause speciation. Geographical isolation occurs
when two populations are…

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1. Scientific journals, as they allow sharing of ideas and experiments, which other scientists can
repeat to see if they get the same results using the same methods, and the more they do,
the more reliable the evidence becomes.
2. Peer review, before publishing, other scientist who work in the…


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