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In animal eggs, the chalaza is composed of one or two spiral bands of tissue that suspend the yolk in the center of the white. It does not act like an umbilical cord; the growing embryo receives its nutrients from the yolk. The purpose of the chalaza is to hold the yolk in place.
Oi! Stop ducking my question!
Quote from: Chemistry4me on 08/08/2009 02:20:16Oi! Stop ducking my question!You can't even spell it right!
robin clark asked the Naked Scientists: We found a worm in a egg and we need to know what to do, also my brother got sick...What do you think?
Can you also tell me which came first? The chicken or the egg?
No, the first chicken had to come from somewhere, so the egg came first.
Yes, it could always have laid eggs. No female chicken has ever reproduced without laying an egg.Obviously the chicken evolved from a non-chicken ancestor, but the first chicken (or the populations of birds we might have called the first chickens due to sufficient divergence of traits) grew inside that ancestor's egg, not a chicken egg. Therefore the chicken came before the chicken egg If you want to talk about the first egg in general (egg cells included), well, that came many hundreds of millions of years ago 
Of course chickens have not always been chickens due to evolution. I am not disputing this.But for as long as chickens have been chickens, they have been laying chicken eggs. No female chicken has ever reproduced without producing a chicken egg. That is what I mean by "chickens have always laid eggs".As I see it, the paradox is resolved by the fact that the first chicken egg was laid by the first chicken, and the first chicken hatched from the egg of its pre-chicken ancestor(which would have differed only imperceptably from a chicken). So the chicken came before the chicken egg, but eggs in general have been around for much longer.