Question

multiple choice
does not affect cells.
is the comparison of relative concentrations of two solutions, separated by a selectively permeable membrane
always causes cells to burst
does not have anything to do with solute concentration
always causes cells to shrink

Explanation:

The question is about the concept of osmosis or tonicity (comparison of solute concentrations across a semi - permeable membrane). The option "is the comparison of relative concentrations of two solutions, separated by a selectively permeable membrane" correctly defines tonicity (or the concept related to solute concentration comparison across a semi - permeable membrane). The other options are incorrect: the first option is wrong as solute concentration differences do affect cells (osmosis causes cell shrinkage or bursting), the second option is wrong as it's not always causing cells to burst (depends on the concentration gradient), and the third option is wrong as solute concentration is related to cell behavior.

Answer:

The correct option is the one with the text "is the comparison of relative concentrations of two solutions, separated by a selectively permeable membrane" (the fourth option in the visual, assuming the options are ordered from left - to - right or as per the layout, but based on the description, this is the correct definition - related option).