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.
Varicose Veins. Varicose veins are dilated tortuous veins with weakened walls and valves that no longer close when they should. They occur in the lower extremities and are important for the health of the skin and superficial tissues. They appear as bulges under the skin of the erect individual and disappear when the limb is elevated above the heart.