Question

Write main features of Mollusca

Answer 1

Widely distributed over the world. Mostly aquatic (marine and few are fresh-water) and some are terrestrial living in damp soil.Body is soft and unsegmented (except Neopilina).Bilaterally symmetrical except gastropodas (asymmetrical) because the shell is coiled.Schizocoel or Haemocoel cavity found as coelom.TriploblasticOrgan system level of body organization.
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Answer 2

main features of mollusca is as follows:
(1)unsegmented soft body.
(2)most have internal or external shell.
(3)have a mantle - a fold in the body wall that secretes the hard shell.
(4)have a radula - a toothed structure used to grate food.
(5)two pairs of gills except in polmonate snails.
(6)muscular foot and/or tentacles.