The species theory, polygenism, held that human races were of different lineages and suggested a hierarchy outlined in the Chain of Being that positioned Africans between man and lower primates.
No, they are involved in the Circulatory System which is responsible for pumping and channelling blood to and from the body and lungs with heart, blood and blood vessels. no veins are not considered an organ because they are a grouping of different tissues like a organ.
Veins are blood vessels that carry blood from your body's tissues to your heart. The heart pumps the blood to your lungs to pick up oxygen. The oxygen-rich blood is then pumped out to your body through your arteries.aricose (VAR-i-kos) veins are swollen, twisted veins that you can see just under the surface of the skin. These veins usually occur in the legs. However, they also can form in other parts of your body. Varicose veins are a common condition.