DarianF Posted April 15, 2022 Share Posted April 15, 2022 3 minutes ago, oddsnsods said: You cant even comprehend the question. "Five hundred and fifty million years ago the hearts of the entire animal world were simple tubular hearts, something that still characterizes heart development at the early embryonic stages in animals today. However, as time went by in certain lineages the hearts became increasingly sophisticated. As they became more sophisticated, new switches for the add-ons were put into place." Evidences for Evolution: The Heart and Circulatory System of Vertebrates https://biologos.org/articles/evidences-for-evolution-the-heart-and-circulatory-system-of-vertebrates Perhaps I don't understand your question. But equally, you don't understand the response. That's okay, maybe some greater minds can figure this one out on our behalf. 1 Quote Link to comment Share on other sites More sharing options...
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