Answer:
Wind
Explanation:
Steel, coal and oil will all run out eventually
I guess that is:
Within the capillaries of the lungs, gases are exchanged by diffusion; O2 diffuses from the alveolus to the bloodstream and CO2 diffuses from the bloodstream to the alveolus.
Answer:
Motion is a change in position measured by distance and time. Speed tells us the rate at which an object moves.
