What is osmosis?

Osmosis is specifically defined as the movement of water across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration. This process occurs in order to equalize solute concentrations on both sides of the membrane.

When considering this definition, the correct answer highlights the fundamental principle of osmosis where water moves towards the region of higher solute concentration. This movement is driven by the concentration gradient of solutes and is crucial for maintaining cellular homeostasis. It is important in various physiological processes, such as the regulation of fluid balance and nutrient absorption in cells.

The other options do not accurately represent the concept of osmosis. For example, the movement of nutrients into cells pertains more to processes such as active transport or facilitated diffusion, and does not involve the movement of water in the context defined by osmosis.