What is one advantage of sexual reproduction over asexual reproduction? a. an increase in genetic variation b. an increase in genetic mutation c. a continuation in genetic weakness d. a decrease in genetic variation

A. An Increase In Genetic Variation 

The blood group o- is most beneficial to have on hand if someone needs a blood transfusion. this is because this blood group can be transfused into any individual having any blood group. o- can give to any blood group. this blood group does not contain any antigens a or b, and hence doesnot cause any reaction in the body.