What is unique about osmosis

Osmosis is the process of purifying a liquid using a membrane and applying force to push the effluent through the membrane. Often used in desalination processes.

 Because osmosis is the diffusion of water. Osmosis will move water from areas of higher concentration to areas of lower concentration. This video discusses the changes which occur in plant cells when they are placed into hypertonic and hypotonic solutions. Osmosis is a type of diffusion that, in biology, is usually related to cells. Diffusion is when molecules or atoms move from an area of high concentration to an area of low concentration. ... Osmosis happens spontaneously and without any energy on the part of the cell.

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.