The Austrian Karl Landsteiner in 1901, when this scientist discovered that, it was safer to reduce the number of patients that died before from blood transfusion.
A, ab, b and o
There are four main blood groups: A, B, AB, and O. These also have a negative and a positive, I.e A+, A-, and so on. This would mean that there are eight different types of blood group: A+ A- B+ B- AB+ AB- O+ O-
Karl landsteaner
pumpkin
4 blood AB, A, B, and O
1. Mammals 2. Reptiles 3. Amphibians 4. In-vertebrates 5. Insects
Microbes are sorted into these 4 groups: Viruses, Fungi, Bacteria and Protozoa
There are four main groups of clouds: cirrus, stratus, cumulus, and nimbus. Each group is characterized by distinct shapes and altitudes in the sky.
A, B, AB, and O.
there are no blood type as ABO there are practically 4 types of blood groups i.e. A, B, AB and O O blood group can donate blood to all other groups A can give to A and AB B can give to B and AB AB blood group can only give blood to AB only but can receive blood from all other groups
The four main groups in the 1500s wereGentlemenCitizensYeomenLabourers
They are the red blood cells,white blood cells,platelets and plasma