The width of a particular microwave oven is exactly right to support a standing-wave mode. measurements of the temperature across the oven show that there are cold spots at each edge of the oven and at three spots in between. the wavelength of the microwaves is 12 cm. a. how wide is the oven?
b. what is the frequency of the microwaves?

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.