Question

how did the discovery of the rhesus factor affect society?
o more patients died from having a transfusion with the wrong rhesus factor.
o new treatments during pregnancy could prevent harm to the developing child.
o less donated blood could be used in the treatment of patients.
o the number of blood types was reduced by half.

Explanation:

The discovery of the rhesus factor led to new treatments during pregnancy that could prevent harm to the developing child. Before this discovery, there were risks associated with transfusions and pregnancy - related complications due to rhesus incompatibility. New knowledge about the rhesus factor allowed for better medical practices and reduced negative outcomes.

Answer:

New treatments during pregnancy could prevent harm to the developing child.