Question

Which action is prevented by the cell membrane?

A~ unlimited flow of water into or out of the cell

B~ the flow of oxygen into or out of the cell

C~ unlimited flow of heat into or out of the cell

D~ the flow of light into or out of the cell

Answer 1

A cell membrane is a semi-permeable membrane which decides what molecules should enter or leave the cell.
for more info you can the diffusion+osmosis process here http://education.seattlepi.com/kinds-molecules-can-pass-through-plasma-membrane-through-simple-diffusion-4587.html
oxygen molecules are small enough to pass through the cell membrane
but for this question, i'll pick answer A
Because if the water molecules exceeds in the cell then the osmosis process will occur and the cell will start to shrink (hypertonic solution/water will move from high concentration to low concentration )

Answer 2

ii i think....