Coral reefs grow on an average of 4 meters per 1000 years. Corals are vicious carnivores because they use venomous tentacles equipped with stinging cells called nematocysts to ambush and immobilize prey (eg. zooplankton and tiny fish etc.). Coral polyps have nematocysts which are stinging cells. The cells are circular sacs with a tiny thread that shoots out like a harpoon. When prey is nearby, the cell wall floods in water which increases the pressure inside and explosively discharges the stingi...
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