Coral reefs are underwater structures formed from the calcium carbonate secreted by corals.
Coral reefs are diverse underwater ecosystems held together by calcium
carbonate structures secreted by corals. Coral reefs are built by colonies of tiny
Coral reefs are some of the most diverse ecosystems in the world, housing tens
of thousands of marine species. About one-third of all marine fish species live ...
Coral reefs are the most diverse of all marine ecosystems. They teem with life,
with perhaps one quarter of all ocean species depending on reefs for food and ...
Oct 8, 2013 ... Coral reefs are large underwater structures composed of the skeletons of coral,
which are marine invertebrate animals.
Dec 16, 2014 ... Coral reefs are unique (e.g., the largest structures on earth of biological ... Corals
are anthozoans, the largest class of organisms within the ...
A coral reef is made of thin layers of calcium carbonate.
Coral reefs are the most diverse and beautiful of all marine habitats. Large wave
resistant structures have accumulated from the slow growth of corals.
Coral reefs teem with life, covering less than one percent of the ocean floor, but
supporting about 25 percent of all marine creatures. However, threats to their ...
Corals are invertebrate animals belonging to a large group of colourful and
fascinating animals called Cnidaria. Other animals in this group that you may