in the first video for chapter 29, we looked at the emission spectrum of excited gases. in this video, we look at the spectrum of colored filters.

I'm not sure what your asking buddy.. but i know that you can weld two peices of steel by pure force and pressure.

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.