Question

(b) State two features that are shown by all molluscs

Answer 1

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A ll modern mollusks have the same fundamental body plan. There are three distinct body zones: a head-foot, a visceral mass and a mantle. Some common features are :

Unsegmented soft body with bilateral symmetry

Presence of an internal or external shell

A toothed tongue (made mostly of chitin) called the radula

A mantle which is a fold in the body wall that lines the shell

Muscular foot (and/or tentacles in some).

Possession of a fluid-filled cavity called coelom

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