Sienna made a chart listing characteristics of two kinds of echinoderms. Which headings correctly complete the chart?

X: Sea Urchins

Y: Brittle Stars

X: Brittle Stars

Y: Sea Urchins

X: Sea Cucumbers

Y: Brittle Stars

X: Brittle Stars

Y: Sea Cucumbers

PLEASE HELP ME

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.