You and I both know people or dogs that we don't consider particularly sophisticated. We sometimes refer to them as "simple" or "Real Housewives." But when it comes to truly simple animals, we shouldn't underestimate them because the animal phyla that we describe as being the least complex actually offer us a vivid way of understanding how animals are structured, and also how they evolved. Simple doesn't always mean dumb. ![]() ![]() Want to find Crash Course elsewhere on the internet? We differentiate them by the number of tissue layers they have, and by the complexity of those layers.Ĭrash Course is on Patreon! You can support us directly by signing up at 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.
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