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Are all humans related to one mother and one father ? What is proof for that? If that is case,that mean brother and sister reproduce, this is incest, so how population survived?

user707264
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    Welcome to the Biology Stack. Please take a [tour] and visit the [help] for more information on this site and what makes a good question and answer. Please note the requirement for showing us your research into this question as outlined in the homework part of the help section. – bob1 Nov 04 '23 at 23:04

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