Don't be stupid leh.. I have my arguement, you have yours?
This is rather childish when some kids saw a
adult-debating-questions and feign smart.
He thought he anyhow say something makes himself looks clever, but
actually not.
Seriouly, I reckoned you to stop such immature behaviour.
If you study bio, you can see a senerio like this...
(simplifed, for the sake of retards like you)
Chicken egg is related to chicken with some c-d-e
to e-f-g genes.
Chicken is not related duck with e-f-g to
h-i-j.
However, chicken egg is related to duck egg with
c-d-e to c-d-h.
Since we know chicken, duck, sparrow, all belongs to the birds
species, their genes is somehow the same. However, there is no
obvious mutation from their body, all genes mutation are related to
the eggs.
So there is a believe the eggs are very similar to other eggs last
time.
This question had been reduced to "where did eggs come from"
instead.
So, please... don't speak blindly next time, thanks.