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I've always thought I wanted to write about animals, especially marine animals. Seeing this series and your efforts in general with the newsletter can only fascinate me and make me read the issues more and more. Thanks for sharing this!

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Wonderfully informative article! Of course sharks are Tetrapodia and have four limbs as did saurians and currently fish, snakes, frogs and grizzly bears. Tetrapodia in the current geological era are the dominant mesoscale life forms. But none so far as I know, after reading your wonderful essay, are so versatile- these critters are veritible Swiss knives of evolutionary adaptations!

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