4 blood
AB, A, B, and O
I think that all blood types are healthy blood types. There are three main types of blood that i know of and then there are others. I think that mine is B+ but i am not sure.
There are 4 main blood types: A, B, O and AB. In addition, each of these can be Rh positive or Rh negative.
The three main blood types are A, B, and O. But there is also AB and a factor in the genetics of blood types called Rh. We either have it (+) or don't (-).
They can have a lot of blood-types
The main three types are; arteries, veins and capillaries.
There are 4 main blood types: A, B, O and AB. In addition, each of these can be Rh positive or Rh negative.
openclosedgastrovascular cavities (sounds weird but its right)
There are many types of blood group systems. ABO and Rh being the two main systems... Others are: Kell, Kidd, Duffy, etc. (there are many more)
There are many good books on blood types. The book "Blood Types" is a simple one to start with. It lists all blood types and what the different types mean.
One of the five main types of white blood cells which play a critical role in fighting infections they have many "roles" though.
3
it has two arteries along with a single vein