AP BIOLOGY

Detailed explanation-1: -Living organisms need water because it plays a vital role in the reactions taking place within organism’s cells and body. Water acts as a universal solvent, providing a medium for the chemical reactions to occur. Substances are also transported from one part of body to the other in the dissolved state.

Detailed explanation-2: -Most living things need food, water, light, temperatures within certain limits, and air. Living things have a variety of characteristics that are displayed to different degrees: they respire, move, respond to stimuli, reproduce and grow, and are dependent on their environment.

Detailed explanation-3: -In animals, water helps in respiration and other basic cell activities. The body of organisms like humans is made up of 70 percent water, which acts as a most essential medium, via which the biochemical activities of the cell take place.