Simple Animals: Sponges, Jellies & Octopuses

Simple Animals: Sponges, Jellies & Octopuses

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


Key Facts In This Video

  • 1

    A major distinction of simple animals is their tissue complexity. (0:50)

  • 2

    The first germ layers appeared about 535 million years ago. (5:42)

  • 3

    Mollusks are simple animals, yet can be very smart. (8:36)

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