Which two groups of flatworms contain only parasites ?

Name one similarity and one difference between the morphology of a brachiopod and a bivalve

Why is excretion necessary to maintain homeostasis?

There is a liquid capsule inside a cup full of liquid. the cup full of liquid has salt in it and the liquid capsule has no salt in it. in which direction will the solvent flow? a. the salt does not have to move b. from the capsule to the larger cup c. equally between the capsule and the cup d. from the larger cup to the capsule