Vaccinations were first used in the year 1796.
The answer is: D. None of the choices are correct
In order to have type ab blood, you need to have genotype blood type A and genotype blood type B.
You could receive it from these scenarios:
- Both of your parents are type ab blood
or
- One of your parents has type a blood while the other has type b blood
If you touch it and it hurts that usually a sign you should not mess with it.
