Which important new idea did ptolemy put forward?

a. the earth is the center of the universe.

b. the earth is round.

c. the sun is the center of the universe.

d. comets have oval orbits.

Which of the following was not an effect of westward expansion? a. native american tribes suffered confinement on reservations. b. native americans learned new techniques of irrigation. c. many native americans died from the spread of disease. d. natural resources were depleted from misuse by white settlers.

What country aided north korea in the korean war?

Why did the outbreak of world war 2 create a need for new military bases across the country?