Which of these is a chemical property?
a.
boiling point
b.
flammability
c.
density
d.
solubility

Flammability. It describes how quickly the substance will react

Go to the bathroom and vape

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.