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These corals are dead—smothered in sediments and overgrown with algae.
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Dead Coral Overgrown with Algae

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A close up view of Phoenix and the rough patches of skin known as callosities that are found on all North Atlantic right whales.
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Phoenix’s Callosities

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A coral reef covered by silt and sand in the Western Pacific Ocean.
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Coral Reef Covered by Silt and Sand

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This Marine National Monument protects a chain of atolls and reefs 1,931-kilometers (1,200-miles) long.
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Northwestern Hawaiian Islands Marine National Monument

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A rendering of an underwater marine scene from the Proterozoic Eon, featuring a creature that resembles a jellyfish and other organisms.
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Ediacaran Community, Proterozoic Eon (2,500 - 542 Million Years Ago)

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Notice the pink tentacles, which “recliners” used to filter feed.
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Recliner Rudists

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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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What is coral? The answer is coral is an animal. This cutaway diagram of a coral polyp shows the location of its photosynthetic algae, or zooxanthellae, which coral needs to survive.
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What Is Coral? A Coral Polyp and Zooxanthellae

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Biofilm (microbial life that clings to underwater painted surfaces and is generally found covering the bottom of ships) is collected from the hull of a cargo ship with a funnel and syringe.
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Sampling Biofilm

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Large organisms, like these tunicates, live inside the recesses of a ship's hull while microscopic organisms form a film across all the painted surfaces on the boat.
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Tunicates On Hull of Boat

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An illustration of the megalodon shark.
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Ancient Giant Megatooth Shark

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A size comparison chart of a variety of squid species.
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What is the Largest Squid? A Squid Size Diversity Chart

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