I personally think the egg, because maybe a a dinosaure (reptile looking thing) had sex with a bird looking thing, maybe that could explain their scaly looking things under their neck and their tallons on their feet. THere would be more than one made in the litter, so they'd become incest then the chicken part of the DNA would mix with the other chicken part of the DNA from the other then form a chicken. so i think this is what it'd look like:
But other than that theory, i think it'd still be the egg because of the bacteria thing forming eggs, then those chickens would be incest then make more chickens, then more then more...
dont think im stupid ;(