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Q.
Which of the following possesses a hard exoskeleton formed by calcium carbonate?
Jharkhand CECEJharkhand CECE 2010
Solution:
Coral animals or corals are marine, mostly colonial, polyploid coelenterate, living in a secreted calcareous skeleton (made up of $ \text{CaC}{{\text{O}}_{\text{3}}} $ ) of their own, eg, Corallium (precious red coral) is used in jewellery, Tubipora (organ pipe coral), etc.