Corals are animals, though, because they do not make their own food, as plants do. Corals have tiny, tentacle-like arms that they use to capture their food from the water and sweep into their inscrutable mouths. Most structures that we call "coral" are, in fact, made up of hundreds to thousands of tiny coral creatures called polyps. Each soft-bodied polyp—most no thicker than a nickel—secretes a hard outer skeleton of limestone (calcium carbonate) that attaches either to rock or the dead ...
They are invertebrates (animals lacking a backbone) belonging to the phylum Cnidaria, class Anthozoa. What we often call “a coral” is actually made up of hundreds or thousands of individual animals called polyps. The polyp uses calcium carbonate (limestone) from seawater to build a hard, cup-shaped skeleton.
Coral are animals that look like plants growing on the ocean floor and other hard surfaces. They are among the slowest growing creatures on the planet. Reefs create underwater ecosystems for a wide variety of plant and animal life. These animals filter the ocean’s water and help keep it clean.
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coral, any of a variety of invertebrate marine organisms of the class Anthozoa (phylum Cnidaria) that are characterized by skeletons—external or internal—of a stonelike, horny, or leathery consistency. The term coral is also applied to the skeletons of those animals, particularly to those of the stonelike corals.
Coral. There are about six thousand species of coral around the world, with some species growing in warm shallow waters near coastlines and others thriving on the dark, cold seafloor of the open ocean. Though coral may look like a colorful plant growing from roots in the seafloor, it is actually an animal.
Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. A coral "group" is a colony of myriad genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in height.
Corals are animals by definition because they do not produce their own food. Plants will produce their own food through photosynthesis but corals eat particles that flow by in the sea. They eat with their tentacle arms. That’s the short answer which we will dive into in more depth below.
Coral is a class of colonial animal that is related to hydroids, jellyfish, and sea anemones. Stony corals, a type of coral characterized by their hard skeleton, are the bedrock of the reef. Stony coral colonies are composed of hundreds of thousands of individual living polyps.
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