Exoskeoeton of coelenterates terates is made up to__________?
Correct answer: A. Calcium
- A. Calcium
- B. Silica
- C. Chitin
- D. Both A & B
Explanation
The hard exoskeleton of reef-building corals, which are coelenterates, is mainly calcium carbonate deposited by the animals. Students may choose silica because some aquatic organisms form siliceous skeletons, but silica is not the usual skeletal material of corals.
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