ELI5- What are blood groups? Why do they differ from person to person? Why can’t a person of one blood group receive blood from a person of a different blood group?

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In: Biology

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So some people’s blood has a bunch of crap in it, either it’s a b or a positive

You’re immune system only likes certain crap, the crap it already has

If you get blood with new crap, you’re immune system beats the shit out of that crap
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