321208 321208 19-05-2020 Biology contestada Sienna made a chart listing different kinds of mollusks. Which headings correctly complete the chart? X: Sea Urchins Y: Gastropods Z: Cephalopods X: Bivalves Y: Cephalopods Z: Gastropods X: Gastropods Y: Cephalopods Z: Bivalves X: Cephalopods Y: Sea Urchins Z: Gastropods