The Giant Barrel Sponge: one of the simpler animals on Earth yet grows to enormous size over a crazily long life, exerts a big influence on reef ecosystems and, unlike a great many animals in our oceans, seems to be thriving ...

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Music

Opening & Closing Themes: Running Waters and Acoustic Meditation by Audionautix (Jason Shaw), from audionautix.com. CC BY 3.0.

Modified versions of: Equatorial Complex by Kevin Macleod (incompetech.com), CC BY 4.0; Short Song 011123, Short Song 011023 and Short Song 011323 by Chris Zabriskie, CC BY 4.0.