400
Major differences between the 3 classes of mollusks. (body, movement, food)
What is gastropods: single/no external shell, obtain food with radula, move by creeping along with broad foot; bivalves: two shells held together by hinge, filter feeder, use foot to move slowly; cephalopods: foot adapted into tentacles around it's mouth, capture prey using tentacles and crushes with beak, swim by jet propulsion?