In science we are studying the Circulatory system. The Circulatory system pumps blood throughout your body to spread nutrients and oxygen to keep you alive. A fun fact that we found when we researched blood types is that Rh factor is named after the Rhesus monkey, because the Rh factor was first observed in the Rhesus monkey. The Rh factor is another antigen on the surface of your blood cell, not everyone has it. If you have the antigen you are Rh+, if you do not have the Rh factor you are Rh-. An interesting question that we have is; is the circulatory system the same for other mammals.