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Population Genetics and Evolution 12 (Evolution and the Origin of Life 15…

- - - - existing alleles decrease in frequency, and new alleles increase
    - - an organism cannot adapt, such as the collision of a large meteorite with Earth
    - - change the allele frequency of a gene pool
    - - survival of the fittest
- - - - initially hot and rocky and had an atmosphere composed mostly of hydrogen
    - - Foremost was intense UV and gamma radiation from the sun