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Sea squire illustrations from Ernst Haeckel.
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Sea Squirts

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An artistic rendering of an ocean landscape as it may have looked during the Archean Eon.
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The Archean Eon (4,600 – 2,500 Million Years Ago)

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This jellyfish fossil is from the Cambrian period, more than 500 million years ago.
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Fossil Jellyfish

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This 1890 painting of Charles Darwin is on display at the Turin Museum of Human Anatomy.
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Charles Darwin

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A 3-D reconstruction of the skull of a fin whale fetus.
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3-D Reconstruction Of Fin Whale Skull

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Spinner dolphins in a small inlet off the Kona coast, Hawaii.
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Solidifying the Dolphin Family Tree

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X-ray image of a longnose butterflyfish
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X-Ray Image of a Longnose Butterflyfish

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X-ray image of a slender snipe eel
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X-Ray Image of a Slender Snipe Eel

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Jorge Velez-Juarbe, predoctoral fellow in the Department of Paleobiology at the Smithsonian's National Museum of Natural History
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Jorge Velez-Juarbe

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An artistic rendering of an ocean landscape as it may have looked during the Archean Eon.
Slideshow

The Ocean Throughout Geologic Time, An Image Gallery

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