In passive absorption, nutrients enter the cell
select one:
a. with a carrier.
b. with the expenditure of energy.
c. from an area of higher solute concentration to one of lower concentration.
d. from an area of lower solute concentration to one of higher concentration.

c. from an area of higher solute concentration to one of lower concentration.

Explanation:

Passive absorption is a process in which  the molecules or ions moves from the region of its higher concentration to its lower concentration or along the concentration gradient. The passive absorption takes place along the concentration gradient, hence no energy is needed for the movement of molecules across the membrane. Simple diffusion or facilitated diffusion is an example of passive absorption.  

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.