A solution that has same concentration os solutes inside and outside is called isotonic solution.As no concentration gradient is developed to induce the diffusion of large amount of water across the cell membrane rather water molecules freely diffuse in and outside the cell.So there is no gain and loss of water by the cell due to which the cell neither shrinks not swell
Response - a reaction to something Adaption - adapting to something. Example : if you're adapting to a new diet, your reaction would be different than what you normally eat
