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A photo of zebra mussels clinging together, the mollusks have successfully invaded brackish and freshwater areas across North America.
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Zebra Mussels (Dreissena polymorpha)

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A shortfin mako glides through the waters off the coast of California.
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Shortfin Mako Shark

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Three bar jacks and a female tiger shark swim through the ocean off the coast of the Bahamas.
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Tiger Shark

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A male great hammerhead shark swims just below the surface of the water in the Bahamas at sunset.
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Hammerhead Shark at Sunset

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A lemon shark pup swims through its shallow mangrove nursery off the coast of Bimini Island in the Bahamas.
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Young Lemon Shark Swims Through Mangroves

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A photo of a sea walnut, a ctenophore.
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Sea Walnut (Mnemiopsis leidyi)

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A blue shark, with a copepod attached to its dorsal fin, coasts through waters near New England.
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Blue Shark

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An oceanic whitetip shark swims near a biologist in the Bahamas.
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Oceanic Whitetip Shark

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A close-up photo of Killer Algae, Caulerpa taxifolia, a seaweed that has proven to be a successful invasive species.
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Killer Algae (Caulerpa taxifolia)

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grains of sand collected from Orient Point, Long Island, NY
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Sand from Orient Point, Long Island, New York

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A rendering of an ocean scene as it may have looked 65 million years ago, when an astroid fell to Earth and triggered a mass extinction event.
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Cretaceous-Paleogene Boundary (65 Million Years Ago)

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Illustration of the Paleozoic shallow water habitat.
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A Mississippian Marine Habitat (359 - 318 Million Years Ago)

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