Which describes a difference between bivalves and cephalopods?

a) bivalves use tube feet for movement, and cephalopods use muscular feet for movement.
b) bivalves live only in ocean environments, and cephalopods live in a variety of aquatic environments.
c) bivalves use a radula to feed, and cephalopods use filter-like structures to feed.
d) bivalves have an open circulatory system, and cephalopods have a closed circulatory system.

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous