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.
Organs are a structure composed of one or more different types of tissues; specialized to carry out specific functions. Some examples of organs are heart, vein's, arteries, anâ¦d capillaries. it is important parts of the body that consist of the heart,intestine,kidney,lungs,stomach. There are many organs in the body. They include heart, lungs, stomach, intestines, brain, nerves, muscles, bones and many more.