Answer:
Erythrocyte
Explanation:
Erythrocytes, or otherwise called, red-blood cells are responsible for transporting oxygen and carbon dioxide to and from the cells and tissues. The reason for this is because of a protein called hemoglobin. The hemoglobin found in erythrocytes allow for transportation of oxygen + CO2 to and from cells.
As you workout your heart rate will increase because you need oxygen.
It is number 1 because enzymes are always being consumed.
Bacteria, archaea, fungi, algae
