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Explanation:
In a case of blood transfusion where blood types are not compatible, the red blood cells will clump together and form clots that block blood vessels, as a result, causing death.
More detailed info if needed:
It's mostly because of antibodies:
What is antibodies: Antibodies are specialised proteins that are produced in response to anything that your immune system might need to fight off, such as bacteria and viruses.
A type blood has anti-B antibody in the plasma
B type blood has anti-A antibody in the plasma
AB has neither A nor B antibody in the plasma
O has both A and B antibody in the plasma.
For example, if someone with Type O blood received blood from someone with Type B blood, the recipient’s immune system would identify the new blood cells as foreign and therefore destroy them.
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