An experimental design in which neither the investigator nor the subjects are aware of each participant's group assignment is called

answer; i believe that the correct answer is (d); // supercontinent

abolish

do away with

unanimous

in complete agreement

secede

separate; break free

inauguration

starting a new position with a formal ceremony.

cooperationist

people who wanted the north to cooperate with the south

surrender

to give up

volunteer

perform a service for free

draft

involuntary service in military

retreat

withdraw; move away from enemy

advisor

expert who gives advice

explanation:

answer; a serious and pervasive issue for many people;

answer; omb;