How do anthropologists explain worldwide variation in human blood types?

Why are constitutions, both federal and state, necessary for our government?

At the start of the war, which countries were on the side of the central powers? check all that apply. ottoman empire great britain russia austria-hungary italy

When did martin luther king, jr. deliver his famous "i have a dream" speech? a. during the montgomery bus boycott b. during the birmingham campaign c. during his acceptance of the nobel prize d. during the march on washington