The primary function of the lungs involving the transfer of oxygen from inhaled air into the blood and the transfer of carbon dioxide from the blood into the exhaled air.
If they get hurt or if anything happens while they are in practice they have a plan to fall back on and that way they also dont have to sue or pres charges wright away.
Well mechanical digestion involves physically breaking the food into smaller pieces but chemical digestion involves breaking down into simpler nutrients that can be used by cells.
