Are sponges the oldest animals? What kind of sponge is that square-panted yellow idiot with the pineapple? Are the inner skins of sponges made up of sperm? From SpongeBob to nature, we're talking sponges today.

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CHAPTERS: 00:00 Intro 00:17 Messy Taxonomy 01:28 The Simplest Animal? 02:18 The Squarepanted Yellow Idiot 02:43 Sponge Layout 05:11 Sex without Brains? 05:12 Types of Sponges 09:42 In the Next Episode