So, what would be the advantage of tadpole or any similar type of living entity to develop first a kind of membrane and then egg-shell?
Do you happen to know one big difference between the reptiles and amphibians? That is part of the answer to the above. Initially it is necessary that a food supply be kept with the developing embryo.
Moreover, as long as you don't give me the exact detailed scheme of genetic transformations that show the evolution and then demostrate this in the laboratory I don't see any reason to accept your wishful hypothesis based on comparition of similarities of different species
A very strong hint that you have made up your mind and are not going to listen to what you are told. Could you explain why someone should take the time to answer your questions? If you will only accept information that is very unlikely to be available why bother discussing things here?
Since there are extant animals with various stages of development of eggs we can, in some sense, "see" the development.
Other problem with your example is that tadpole is already quite developed and so doesn't need any shell. And if you see the substance of an egg, take it out and put it in the water - no any chicken will develop in that way and you will be hungry too. What a big loss.
Don't try to be funny until you have developed a bit of credibility here. Just what does the comment about the "substance of an egg" have to do with anything?
You do know that the tadpole is a late stage in the gestation don't you? It doesn't start out that way.
This message has been edited by NosyNed, 05-12-2005 01:05 AM
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