You can find 4 blood styles: A, B, AB, or O. Also, blood is possibly Rh-beneficial or Rh-detrimental. So When you've got form A blood, it's possibly A beneficial or maybe a adverse. Which sort you will be is vital if you need a blood transfusion. And your Rh https://www.youtube.com/watch?v=buIHtQY7fCU