write four characteristics of mollusca
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Their body has a cavity. The body is divided into head, dorsal visceral mass, and ventral muscular foot and mantle. The head comprises of tentacles and compound eyes. The body is covered by a shell made up of calcium carbonate.
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Characteristic Features of Phylum Mollusca ( Any four) :---
1) They are bilaterally symmetrical.
2) They are triploblastic, which three layers.
3) They show organ system grade of organisation.
4) The body is soft and unsegmented.
5) Body is divisible into three regions – head, a visceral mass, and ventral foot.
6) Body is covered by a mantle and shell.
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