If all living systems, not plants, have blood; then why do blood types matter?

Prevent risks

Explanation:

The importance of knowing your blood type is to prevent the risk of you receiving an incompatible blood type at a time of need, such as during a blood transfusion or during surgery. If two different blood types are mixed, it can lead to a clumping of blood cells that can be potentially fatal.

because when humans get blood transfusions they need the same type of blood in their body or they will reject it and die.

Explanation:

each blood type has certain antigens and antibodies that will only accept a certain blood type. type O can give to all blood types (A,B,AB,O) but can only receive from type O. Type AB can receive from A,B and O because it has both A and B antigens. if you were to give type A to a type B person the type B antibodies would attack the foreign type A with its anti-A antibodies.

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

1 is the answer to this problem