Respuesta :
Coral reefs are limited to shallow water, and there is a concern that rising sea levels will affect the reefs this is because their symbiotic zooxanthellae require light to survive.
What are coral reefs?
A coral reef is an underwater ecosystem that is made up of corals that construct reefs. Coral polyp colonies are bound together on reefs by calcium carbonate. The majority of coral reefs are composed of stony corals, whose polyps group together.
In the animal phylum Cnidaria, which also includes sea anemones and jellyfish, coral is a member of the class Anthozoa. For support and protection, corals secrete hard carbonate exoskeletons, unlike sea anemones. In warm, shallow, clear, sunny, and agitated water, most reefs thrive. Early Ordovician coral reefs first emerged 485 million years ago, replacing the microbial and sponge reefs of the Cambrian.
To learn more about coral reefs with the help of given link:
https://brainly.com/question/10970167
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