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.
Donor organs from cancer patients should be transplanted despite risks. Organs from donors with cancer should be transplanted despite deaths, an official report has concluded. Donor organs from patients with cancer should be transplanted despite deaths following the practice, an official report has said.