Blood is a body fluid in humans and other animals that deliver necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. Even though the blood in our veins is used for the same purpose – delivering oxygen and nutrients to every cell in our body, we all have different types, and therefore different requirements. When we lose blood, we have to have it replenished. Here are some crucial facts you’d be wise to know about your own blood! Blood type and Rh How many people have it? O + 40 % O – 7 % A + 34 %…