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Invertebrates: Backbone of the Ocean

Invertebrates may lack a spine, but they form the backbone of ocean communities. These bizarre creatures form the base of food webs, break down organic matter, and filter seawater. Close to the ocean's surface, tiny invertebrates like krill feed enormous creatures like baleen whales. Miles down on the seafloor, scientists are still discovering new invertebrates, with novel species of corals and sponges being identified each year.