all the people on earth are members of the same biological species according to this, the correct answer is option "D" which is all people can mate with one another and have children.
Speciation is how a new kind of plant or animal species is created. Speciation occurs when a group within a species separates from other members of its species and develops its own unique characteristics.
Thus, option "D" is all people can mate with one another and have children.
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