Use equilibrium principles to explain the reactions occurring at the region of the lungs. Start with the diffusion of oxygen from the lungs into the blood and finish with carbon
dioxide being exhaled from the lungs

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Decomposition is the cycle at which bacteria breaks down any organic material into the soil

Ireally don’t know this