The importance of blood groups is highly important. All humans haven't got the same blood group. The reason? we do not know. Blood groups range from a - b - ab- o- a b ab o a + b+ AB+ o+. if two persons had different blood types then you are risking getting diseases such as; aids and hiv. These diseases are fatal.
Yes , there are bloodgroups in animals also.
Provided the other bloodgroups match (e.g. rhesus antigen) then yes, of course.
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