Answer:This arrangements enabled the left and right ventricles of the heart to mix the blood with oxygen.The mixing reduced oxygenation efficiency : SO THAT HIGH PRESSURE IN THE VENTRICLES ,AND VESSELS(pulmonary) pushes blood saturated with CO2 to the Lungs and through the AORTA Oxygen saturated blood into the systemic circulation.
Oxygenation efficiency is the maximum amount of oxygen that the body can consume.Oxygenation is the addition of oxygen to the body of organisms.
Step-by-step explanation: