Whales are mammals meing they breathe air with their lungs, but at some point evolutionsists say they were a fish with gills and breated oxygen from the ocean's water, well apparently at the time of transition from gills to lungs the first baby came out not as an egg but alive, during the transition was it half and egg and half an embryo and it just decided to change into an embryo, well wouldn't the very first whale baby have drowned that was born in the depths of the sea as an embryo with lungs?
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Whales evolved (quite some time ago) from land mammals, which evolved (a long way back) from reptiles, which evolved (another long way back) from fish. Ever heard of lungfish? THAT is more likely the type of transitional form you are looking for -- a species that can breathe in either water or air.
If the transition had been directly from fish to mammal, then sure, he'd have a point, but, uh...he doesn't.
Actually, without knowing it, this clever fellow actually pointed out one of the shining proofs of evolution. For decades, the fossil record was sadly barren of evidence of land to sea transitions. However, the missing intermediate forms have been found in the past 20 years that demonstrate quite nicely the transition from land mammals to basilosaurus to toothed whales to baleen whales.
Note: the following is something that I can imagine happening. I have no scientific evidence to back it up; I am not any sort of scientist. I've just read a few books and not had my imagination ground out of existence.
@birdseatbugs: Bird eggs have an amniotic sac inside the shell. The amniotic sac is common to all reptiles, birds, and mammals. In fact, it's given its name to the group uniting these; the Amniota.
Confused?
So were we! You can find all of this, and more, on Fundies Say the Darndest Things!
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