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.
Organ Donation. What organs and tissues can I donate? Organs you can donate include heart, kidneys, pancreas, lungs, liver and intestines. Tissue that can be donated include eyes, skin, bone, heart valves, veins and tendons. One person can help 100 other people.