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Study: Plankton Are a Major Oxygen Source on Earth

Tiny ocean creatures collectively called plankton are mostly thought of as food for whales and other large marine animals. But a four-year global study has discovered, among other things, that plankton are a major source of oxygen on our planet. Plankton are animals, algae, bacteria and other microscopic organisms invisible to the naked eye. They inhabit the upper layers of the world’s oceans, seas and freshwater.   In a project called Tara Oceans, led by the French nonprofit...

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