In Mollusca ,  I. digestive tract is a complete and complex with ciliary tracts for sorting small
Channel: Doubtnut
Date: 2020-05-03

In Mollusca ,  I. digestive tract is a complete and complex with ciliary tracts for sorting small particles .  II.shows caste system .  III.has a pair of respiratory trumpets .  IV.are blood suckers of vertebrates .  Choose the correct option .