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        9-12

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        Part of Crash Course
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        Contains Adult Language

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        Simple Animals: Sponges, Jellies, & Octopuses | Crash Course Biology #22

        Hank introduces us to the least complex animals: beginning with sponges and finishing with the most complex molluscs, octopuses, and squid. We differentiate them by the number of tissue layers they have and by the complexity of those layers.

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