Question

which best describes dynamic equilibrium?
there is a difference in concentration on either side of the cell membrane.
there is an uneven distribution of particles inside and outside the cell.
particles are moving into and out of the cell, but their concentrations remain stable.
a concentration gradient is forcing water out of the cell and particles into the cell.

Explanation:

Dynamic equilibrium in a cell - context means particles move across the membrane, but net change in concentration is zero. The first two options just describe concentration differences without movement balance. The last option focuses on a one - way force due to gradient, not equilibrium. The third option correctly states that particles move in and out while concentrations remain stable.

Answer:

Particles are moving into and out of the cell, but their concentrations remain stable.