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Give scientific reasons : Annelids are...

Give scientific reasons :
Annelids are evolutionary precursors of molluscs. 

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Annelids are considered evolutionary precursors of molluscs as they do not have metameric segmentation. Besides, its trochophore larva, it has structural similarities to annelid trochophore larva. These evidences suggest that molluscs have descended from annelids.
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