How were the mongols able to create a large empire, and why did it collapse?

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

What are the expressed and implied powers of the president

The telegraph, the transatlantic telegraph cable, and the telephone were important to businesses after 1850 because of a. they created a system for developing new inventions. b. they filled a need that other inventions of the day could not. c. they attracted investors and created the stock market. d. they made picture-taking a popular american pastime.