Which describes a difference between cephalopods and gastropods? cephalopods have a water vascular system, and gastropods have an open circulatory system. cephalopods live only in ocean environments, and gastropods live in a variety of environments. cephalopods have a simple nervous system, and gastropods have a complex nervous system. cephalopods are the largest group of mollusks, and gastropods are the smallest group of mollusks.

The correct answer is: Cephalopods live only in ocean environments, and gastropods live in a variety of environments.  

Cephalopods are the only within the phylum Mollusca with closed circulatory system. Those animals are with the most intelligent of the invertebrates with develop sensory system and large brains.

Gastropods are the largest group within Mollusca phylum. They have open circulatory system, no hearing organs and simple vision organs.

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