Octopus is - (1) an arthropod (2) an echinoderm (3) a hemichordate (4) a mollusc

Octopus is - (1) an arthropod (2) an echinoderm (3) a hemichordate (4) a mollusc
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(4) a mollusc Explanation: Octopus is an animal of classCephalopoda 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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