What led adolf hitler to order german submarines to attack american ships?

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

The transcontinental railroad runs from the to the i. north ii. south iii. east iv. west a. i and ii b. ii and iii. c. iii and iv d. ii and iv

What from the columbian exchange had perhaps the biggest impact on the world?