2007-03-31 07:14:14 · 3 answers · asked by saraaaaa:D 1 in Science & Mathematics ➔ Biology
they have a more developed head region (cephalization) than gastropods and bivalves
2007-03-31 07:17:45 · answer #1 · answered by The Tourist 5 · 0⤊ 0⤋
Cephalopoda have a more developed brain but they also lack the shells the others do. They have cells called chromatophores that allow them to change color and their eyes can not only tell light from dark but also brightness, size, shape, and horizontal or vertical orientation of objects. They have a closed circulatory system with 2 hearts (branchial hearts).
2007-03-31 07:30:34 · answer #2 · answered by Trin 2 · 0⤊ 0⤋
Cephalopods
1. Have the foot divided into tentacles
2. Are far more mobile
3. Have more advanced nervous system, including better brains and good eyesight
4. Have many members without shells
2007-03-31 07:24:11 · answer #3 · answered by ecolink 7 · 0⤊ 0⤋