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Explain in detail the characteristics of...

Explain in detail the characteristics of phylum Mollusca.

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i.Molluscs have a soft and slimy body.
ii.They are aquatic or terrestrial. Most of the aquatic molluscs are marine, but few of them inhabit fresh water too.
iii. Members of phylum Mollusca are triploblastic, eucoelomate, non-segmented and bilaterally symmetrical.
iv.The body of molluscs is divided into head, foot and visceral mass.
v.Visceral mass is covered with a mantle that secretes a hard, calcareous shell. This shell is present either externally or internally or even absent in some animals.
vi. These animals are unisexual. e.g. Bivalve, snail.
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