According to Freud, the ego uses defense mechanisms in order to a. help the id get what it wants. b. reduce anxiety. c. channel psychic energy into a socially productive action. d. satisfy the superego's demands.

Yes you are cute answer theories to explain the colonization of the new world the last great habitable landmass to be occupied by humans focus on the bering land bridge, or beringia, which emerge by siberia and alaska the last ice age.