https://www.khanacademy.org/science/grade-12-biology-snc-aligned/xa8ba3a087f1f5288:human-physiology/xa8ba3a087f1f5288:osmoregulation/a/osmosis-osmolarity-and-tonicity 2026-03-26T05:30:45.387289448Z Osmosis, osmolarity, and tonicity Learn about the movement of water across membranes in biological systems. article