Simple Animals: Sponges, Jellies & Octopuses

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Some animals, like jellyfish and simple animals, can function without hearts, brains and other vital organs.


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Key Facts In This Video

  1. A major distinction of simple animals is their tissue complexity. 00:50

  2. The first germ layers appeared about 535 million years ago. 05:42

  3. Mollusks are simple animals, yet can be very smart. 08:36