Question

who was a first persen in earth

Answer 1

there are many theories as answers to this question 
one of the most popular one says that Adam was the first person on Earth

Answer 2

heya frnd,
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first person in earth
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according to science :- that is not specified.early human beings were first persons .

according to Hindu mythology :- Manu was the first person. as the childrens/next generations of Manu, we are called Manushy (human).

according to Christian community :- Adam and hawwa were the first persons..

hope it helps..