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.
Here are answers to some of your questions about donating your organs and tissues. The Organ Donor Register is a list of people who want to donate their organs and/or tissue to help save or enhance lives. Donation for transplant can be the best treatment for most people with organs and/or tissue failure. Donated tissue can save or improve the lives of people suffering from illness or injury. Living donation involves giving an organ and/or a tissue to someone who needs a transplant.