Question

give three reasons why a snail and an octopus are classified under the same phylum.

Answer 1

Snails and octopus are classified under the phylum mollusca because of the following three common features:
i. A mantle cavity in the dorsal part for respiration, excretion etc.
ii. Presence of radula for feeding.
iii. Presence of two paired nerve cords or three in bivalves.