File:In the smallest creatures god.png

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

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

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Blue-Green in the Ocean & Life on Earth

"A single kind of blue-green algae in the ocean produces the oxygen in one of every five breaths we take"

~ from "The World Is Blue: How Our Fate and the Ocean’s Are One" by Sylvia Earle

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"The Tiny Little Ones - Plankton"

"Ecosystems of the Sea"

www.tinybluegreen.com

It is estimated that marine plants produce between 70 and 80 percent of the oxygen in the atmosphere. Nearly all marine plants are single celled, photosynthetic plankton-algae...

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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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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

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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

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Sea Drifters (slideshow from BBC - 2010) -- http://news.bbc.co.uk/2/hi/science/nature/8498786.stm

Close up images of plankton, the tiny creatures that hold the key to survival in the world's oceans