I feel hen came she gave egg and then again a chick came out and thus the cycle went on . therefore  answer is anyonumus
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hen first is come hen she is give egg
Hen came first as an egg cannot hatch on it's own it need warmth which is possible only when her mother sits on it
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no still it's not that possible
it is
and if you see it biologically all the species are formed by gentical disorders
oh i see
and i think the reasons mentioned above are fine enough :P