A flashlight shines light on a plane mirror as shown in the diagram. Which path will the reflected light travel?
1: W
2: X
3: Y
4: Z

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.

An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to move. 

I’m not sure about this question