Q.

Octopus is -

A. an arthropod
B. an echinoderm
C. a hemichordate
D. a mollusc
Answer» D. a mollusc
Explanation: Octopus is an animal of class- Cephalopoda and phylum Mollusca. The shell is absent. It is found at bottom of the sea. It kills its prey with poisonous saliva. It can change its colour.
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