What made the climate of northern africa change from tropical to grasslands and then to desert?

What clause of the treaty of versailles in particular left the germans feeling like they were “stabbed in the back? ” by the victors?

How do i do this? true or false? : elephants have the same dna as humans and bananas alike.

Which of the following encouraged westward expansion? a.the government decreased the price of federal land. b.each of these represents actions taken to encourage westward expansion. c.the government decreased the price of federal land d.the second national bank lowered the cost of borrowing money (reduced interest rates)