There are actually 4 blood styles: A, B, AB, or O. Also, blood is possibly Rh-favourable or Rh-destructive. So When you've got style A blood, It is really possibly A beneficial or maybe a detrimental. Which sort you're is essential if you need a blood transfusion. And your Rh https://www.youtube.com/watch?v=buIHtQY7fCU