PZ first noted that the study of development provides, as Charles Darwin noted and as remains the case, perhaps the clearest evidence for evolution of any branch of biology. He first answered the last and key part of the first of the ten questions distributed in advance by Uncommon Descent urging their fellow-idiots to attend the talk:
1) In light of the Darwinian evolutionary paradigm, can you account for the observation that the eggs of the five classes of vertebrate (i.e. fish, amphibians, reptiles, birds and mammals) begin markedly different from each other? While the cleavage patterns in four of the five classes show some general similarities, the pattern in mammals is very different. Furthermore, in the gastrulation stage, a fish is very different from an amphibian, while both are starkly different from reptiles, birds and mammals, which are somewhat similar to each other. Doesn't Darwinism predict a pattern wherein the earliest stages are the most similar and the later stages are the most different? [emphasis added]
The answer is, of course: "No.", thus disposing of the rest of this question and the remaining nine, all of which were premised on this ignorant misconception.