You'll find four blood types: A, B, AB, or O. Also, blood is possibly Rh-favourable or Rh-unfavorable. So When you have kind A blood, it's possibly A beneficial or simply a detrimental. Which sort you might be is essential if you want a blood transfusion. Plus your Rh component https://www.youtube.com/watch?v=buIHtQY7fCU