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The first known filter feeder is a large shrimp-like creature called Tamisiocaris borealis. The feather-like structures on its head were used to rake plankton from the sea.
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The First Filter Feeder

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Diagram of narwhal anatomy and tusk function
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Narwhal Anatomy

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The Galapagos Islands site in Ecuador was inscribed on the World Heritage List in 1978. Located in the equatorial Pacific Ocean nearly 1000 km from South America, the Galapagos Islands and the surrounding marine reserve are a unique "living museum and show
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Sally Lightfood Crab, Galápagos Islands, Ecuador

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Charles Darwin's first diagram of an evolutionary tree appears in his First Notebook on Transmutation of Species (1837).
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Darwin’s Evolutionary Tree Diagram

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Vertebrates evolved in the sea and eventually moved onto land. The ancestors of whales later returned to the sea.
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Whales Returned to the Sea

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This family tree shows how the ancestors of whales moved gradually from land to sea.
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The Whale Family Tree

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An illustration of multispecies communities of dugongs from India, Mexico and Florida
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Multispecies Communities of Seacows

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Extreme close-up of great white shark skin denticles.
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Biomimicry Shark Denticles

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Photograph of a transparent polka-dotted squid in the dark ocean.
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Cockatoo Squid

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Illustration of a four-legged proto-whale with webbed feet.
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Early Whale with Webbed Feet

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Color illustration of an ancient bivalve.
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Elevator Rudists

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A rendering of an underwater marine scene from the Cambrian Period, featuring an arthropod, annelids, and other animals.
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Cambrian Period (542 – 488 Million Years Ago)

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