Fill in the chart using the food web pictured. Only use each organism once, and some may not be used at all. Producer -
Primary consumer -
Secondary consumer -
Autotroph -
Heterotroph -
Herbivore -
Carnivore -
Omnivore -

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.