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.
Hope this helps, if you have any questions please feel free to ask them in the comment section below-I'm more than happy to answer them!
