A(n) is a single explanation and is supported by lots of point
evidence over a long period of time.*

hypothesis

educated guess

theory

natural law

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.

Idon't understand is there supposed to be a list or something if there is pm or add in under this message i will do my best to .

Phagocytes contain digestive enzymes to facilitate the process of phagocytosis