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Published 4 years ago by AdelleChattre with 1 Comments

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  • Gozzin (edited 4 years ago)
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    This was absolutely mind blowing!

    All vertebrates—fish, reptiles, birds, and mammals—have a tectum. Even lampreys have one, and they appeared so early in evolution that they don’t even have a lower jaw. But as far as anyone knows, the tectum is absent from all invertebrates.

    Then how do they function?

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