Which of the following describes molusca?
A. a process in which molecules pass through a semi-permeable membrane from a less concentrated solution to a more concentrated solution
B. the phylum name for organisms that have a relatively simple body structure, which is evidence of their place in the early evolution of life
C. relationships in which plants or animals of different species may be dependent on one another for survival
D. a porous marine invertebrate who pulls water through its soft body in order to obtain oxygen and nutrition