A group of students was discussing whether the concept of magnetic field is just a theory or if magnetic forces can be shown sixes between objects that are not touching. some of the students were convinced that these forces only exist in theory while the rest of the students society to prove that these forces actually exist. how can the students who did the magnetic forces between objects that are not touching each other?

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.

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.