Select all that apply: Which of the following are characteristic of most molluscs? ("most" in this case means that there is one trait that will NOT apply to cephalopods, but will apply to all of the other groups. The other traits selected will apply to all molluscs.) incomplete digestive system complete digestive system nephridia/ metanephridia protonephridia open circulatory system closed circulatory system ctenidia or "lungs" for gas exchange How do cone snails feed? They create a mucus net to entrap floating prey They smother bivalves They use chemicals and their radula to bore a hole through the shell of their prey They have a highly modified radula that is used like a harpoon to capture prey. What problem is created by torsion? the digestive system will now only have one opening potential fouling of the head and gills uneven distribution of the weight of the shell complete closure of the mantle cavity.