Answer:
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Homo.
The genus and species for humans is Homo sapiens, "Homo" being the genus, and "sapiens" being the species
Random changes in allele frequency in a population are usually called genetic drift. The reason why this is the answer is because it is a very specific word which is used to describe exactly that - random changes in allele frequency.
All the other cases; answers, here aren't correct and don't apply.