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Coral is sharp because it is made of calcium carbonate, a hard substance that forms into tiny, sharp structures called "polyps." These structures help coral to protect itself from predators and provide support for its skeleton.
Coral can hurt people when they come into contact with the sharp edges of the coral's skeleton, which can cause cuts or scrapes. Additionally, some species of coral have stinging cells called nematocysts that can release venom when touched, leading to skin irritation or allergic reactions in some individuals.
The texture of the ground of coral reefs can vary depending on the types of corals present. Some areas may have a sandy bottom, while others may be covered with hard coral formations. Overall, the ground of coral reefs is often uneven and may have crevices and structures that provide habitats for various marine organisms.
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A person who studies coral is called a marine biologist or a coral biologist. They specialize in researching and understanding coral reefs, their ecosystems, and the various organisms that depend on them.
Coral is not a carnivore. Coral is a marine invertebrate that obtains most of its nutrition from a symbiotic relationship with photosynthetic algae called zooxanthellae, which live inside the coral's tissues and provide energy through photosynthesis.