Respuesta :

lilynguyen53

Answer:

-O

Explanation:

negative o blood is the most common because about more than 50 percent of the earth has it and about 45.5 percent of people in hospitals all around the earth need transfusion blood and O or -O blood can save any type of blood

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kjstyles4317

Answer:

O negative

type O negative blood is the universal blood type needed for emergency transfusions and for immune deficient infants.