"To comprehend evolutionary Theory, one must first understand that it’s only ever a matter of changing proportions –altering or enhancing existing features to build on what is already there. Developmental biology, genetics, and comparative morphology combine to confirm many of these taxonomic stages such that organs do not seem to have appeared abruptly or fully-formed as if out of nowhere, because there is an implied evolutionary origin evident in every case. Even the transition of fish-to-tetrapods, dinosaurs-to-birds, or apes-to-men are each are just a matter of incremental, superficial changes being slowly compiled atop successive tiers of fundamental similarities. These represent monophyletic clades which will forever encompass all the descendants of that clade. This is why birds are still dinosaurs, and humans are still apes, and both are still stegocephalian chordates."
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