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Hank introduces us to the "simplest" of the animals, complexity-wise: beginning with sponges (whose very inclusion in the list as "animals" has been called into question because they are so simple) 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.
First Air Date : Jan 30, 2012
Last Air date : Apr 30, 2024
Episode : 81 Episode
Season : 2 Season
Runtime: 15:14 minutes
Studio: YouTube
Country: United States of America
Cast: Samuel Ramsey
Crew:
