@TheAstroChuck Well no actually, since pterosaurs and Theropod Dinosaurs were laying eggs first and they managed to somehow survive the K.T. Extinct Event then evolved slowly into modern birds then the ancestral bird like animal came first.

@TheAstroChuck Ergo, the ancestral bird had to come first to evolve and lay the first chicken like egg then.

@TheAstroChuck That may be so BUT the ancestor of the Pre-Chicken Ancestor would have laid the eggs that gave rise to the Pre-Chicken in the first place, would it not?

@TheAstroChuck Logically speaking one cannot get an egg WITHOUT an Adult bird first laying it, is that not so?

@TheAstroChuck That is where you are wrong. Selection works on populations; but evolution, being dependent on a random mutation, works on a single animal. If the mutation confers some advantage then selection will tend to cause the mutated trait to spread through the population.

@DoctorJohn 100% correct on that one.

@TheAstroChuck So, as well as being an Astrophysics Professor you are trying to tell us that you are also an expert in Evolutionary Sciences, Genetics and Cellular Biology as well.
If that be so, then perhaps you can explain why the early hominids who left Africa and entered the northern regions of Europe, etc, developed pale skin tones whilst their ancestors had dark skin tones to begin with and why there are no dark skin tones left to this day in the 'original' European/Caucasian populaces?

@Triphid, your mate has read all the right books, but he has failed to understand them. A professed "freethinker" his mind is closed. I'm not babging my head against the wall any more, and I suggest you do the same.

@DoctorJohn Yep, I'm no longer going to TRY to explain anything to him either.
Also, some little voice inside me is suspecting that he's try to start a pissing contest with me or anyone else and I'm not one for those kinds of things anyway.