Answer:
Following
are the main distinguishing features of phylum Mollusca:
(i) The animal shows bilateral symmetry.
(ii) They have soft bodies, so they are also called soft
bodied animals.
(iii) Body is segmented and divided into head, foot and
visceral mass.
(iv) A glandular fold, the mantle, is present over the
body.
(v) There is a calcareous shell around the body in some
molluscs.
(vi) They have open circulatory system.
(vii) Kidney-like organs for excretion are present.
Examples: Pila, Sepia, octopus.
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