![](http://www.alamy.com/thumbs/6/8D5AC2FA-070C-437D-8180-37D47098FCBD/2RFN5YD.jpg)
Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals.
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Keywords: 19th, animal, animalia, aquatic, art, biology, biome, century, cephalopod, cephalopoda, colorized, coral, cuttlefish, decapodiformes, drawing, ecosystem, enhanced, habitat, historical, illustration, life, marine, mollusk, monster, ocean, ocean-dwelling, reef, sea, sea-dwelling, sepiida