In which direction does the head of the molecules of the plasma membrane face? toward the middle

away from water

toward the outside

toward the head of another molecule

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Why must humans find substitutes for many minerals found on earth? (a) form at an extremely slow rate (b) controlled by other countries (c) too deep in the earth to collect