O- “universal donor” blood
In: Biology
Blood has things in that not everyone can handle . Type A blood has A stuff in it. Type B has B stuff in it. So you can be type A, type B, or if you have both, Type AB. Type O has nothing unusual in it so it can be given to anyone.
The + or – is a third type of stuff. Plus means you have it, minus means you don’t. So O- blood has nothing at all unusual in it so it can safely be given to anyone. Type AB+ has everything unusual in it, so that blood can only be given to AB+ people.
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