How do drones help pilots stay saf e in combat

Which nonverbal cue most likely indicates that a person is open to a conversation? lack of eye contact crossed arms smiling mouth o monotone voice

Which landmark supreme court case ruled that segregation by race in public education was unconstitutional? a.miranda v. arizona b.plessy v. ferguson c.brown v. board of education of topeka d.alexander v. holmes county board of education

The incas used quipus to options -preserve there history -keep records of people and goods -decide when to plant crops -decide work amoung peasant familys