Help Please! its another cell functions

last option!

Explanation:

The oxygen molecules will spread out evenly and many will enter the cell by passing through tiny openings in the membrane.

Explanation:

A cell membrane will allow the oxygen to enter by diffusion. Diffusion is the movement of particles from an are of higher concentration to an area of lower concentration. Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current