Because their bodies tell them that they need more oxygen and so breathe faster, and try and get the oxygen their body requires and depends on.
Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.
Yes, blood doping can improve your performance. Red blood cells contain lots of oxygen, thus, by filling your body with this oxygen-rich blood, you gain a lot more endurance and strength.
<span>A: Which species of cricket did you collect? - apex</span>
