The body system that provides support and protection as well as being a site of blood cell production (hemopoiesis) is the system.

The system is referred to as immune system. the immune system is made of network of cells, proteins, tissues and organs that work in coordination in an attempt to protect the body. the type of cells involved are called white blood cells also known as leukocytes. immune system has the ability to detect a wide range of agents referred to as antigens such as viruses, bacteria among others. after this detection, it thereafter launches a defense mechanism to clear them from the body. 

It might. it might because if you think about if they discovered if we came from (lets say something funny like aliens) and thy found cells that matched and they would have t do more research about it but would most probably change their theory.