How are scientific question turned into investigation ?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half