<span>The blood flows through hepatic portal vein traveling to the liver, then makes it another artery which is posterior vena cava making it to the heart. It makes itself afterward to the pulmonary artery where it reaches the lungs, going back to the heart via the pulmonary vein. Eventually, it goes to the kidney through different parts such as the aortic arch, dorsal aorta and the renal artery.</span>
Irrigation system gave the ancient civilizations fertile land which helped crops grow. It also allowed for ease of watering which made the process of farming faster.
