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https://en.wikipedia.org/wiki/Extinction

http://www.greenpolicy360.net/w/Tree_of_Life

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The Smallest Marine Plants

The smallest living things from the plant kingdom living in our oceans are single-celled green algae. These tiny cousins of the redwood tree can be measured at 5 micrometers or less, about five times larger than marine bacteria but still quite small. You would have to line up 5,080 of these little plants to reach 1 inch.

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The Smallest of the Small: Marine Viruses

Just as on dry land, the oceans are full of millions of viruses, by far the tiniest form of life. The smallest are about 40 nanometers in diameter. To put that into perspective, if you lined these marine viruses up end to end alongside a ruler, you would have to lay down 635,000 of them before hitting the 1-inch mark. Even the largest marine viruses are only about 400 nanometers.

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Zooplankton

Drifting oceanic microscopic invertebrates

Greek zoon (ζῴον), meaning "animal", and planktos (πλαγκτός), meaning "wanderer" or "drifter"

https://en.wikipedia.org/wiki/Zooplankton

Phytonplankton

Phytoplankton /ˌfaɪtoʊˈplæŋktən/ are the autotrophic components of the plankton community and a key part of oceans, seas and freshwater basin ecosystems. The name comes from the Greek words φυτόν (phyton), meaning "plant", and πλαγκτός (planktos), meaning "wanderer" or "drifter"

https://en.wikipedia.org/wiki/Phytoplankton