Answer:
(d) Corals are marine invertebrates of
phylum-Cnidaria. They live in compact colonies of many identical individual
'polyps'. The group includes the important reef builders that inhabit tropical
oceans and secrete calcium carbonate to form a hard skeleton.
Although some corals can catch small fish and plankton,
using stinging cells on their tentacles, like those in sea anemone and
jellyfish but most corals obtain the majority of
their energy and nutrients from photosynthetic unicellular
algae that live within their tissue.
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