What are corals ?

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Q: 42 (SCRA/2007)
What are corals ?

question_subject: 

Science

question_exam: 

SCRA

stats: 

0,27,52,11,27,19,22

keywords: 

{'corals': [0, 0, 1, 0], 'annelids': [0, 0, 2, 0], 'molluscs': [0, 0, 1, 0], 'echinoderms': [0, 0, 1, 0], 'coelenterates': [0, 0, 1, 0]}