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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
overview

Corals and Coral Reefs

 Coral reefs are the most diverse of all marine ecosystems. They teem with life,...
two mangrove trees in the crashing waves
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Mangroves

 Mangroves are survivors. With their roots submerged in water, mangrove trees thrive...
On average, Arctic sea ice has decreased by four percent per decade since the late 1970s.
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Sea Level Rise

 The ocean never stops moving. When you visit the beach, waves roll in and recede...
A photo of a squid using bioluminescence to hide in the deep sea.
overview

Bioluminescence

 You may have seen the sparkle of fireflies on a summer’s night. The fireflies...