Question

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Answer 1

They are a source of food as well as jewellery. The hard shells are used to make beautiful jewellery pieces. In some regions of the world, these are also raised as pets, even though it sounds bizarre. 

Answer 2

Following are the main distinguishingfeatures 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.

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