What happens to the molecules of a substance as heat energy decreases

This drawing shows a human body system. what is the primary function of this body system?

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?