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Saltwater Ecology: Cnidarians (1:43)
Together, algae and coral animals extract minerals from sea water and redeposit them. This process forms coral reefs.
Saltwater Ecology: Comb Jellyfish (0:28)
Comb jellyfish are not cnidarians, but they are predators. They are 98 percent water and, like other jellyfish, transparent and nearly invisible.
