A bird resis on a branch in an oak tree, 12 mabove the grassland, as it watches its young birds. The bird suddenly needs to pass some solid waste. How fast is the solid waste travelling as it hits the grassland?

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.

Iknow the first part it is the average star i am not 100% sure