Which two farm animals did europeans bring to the americas?

How did the northern u.s. change during the 19th century? select the best choice from the answers provided. a. it became more industrial. b. it became more agrarian. c. it became less populated. d. it became less diverse

What can you conclude was a benefit of living a more settled life for prehistoric man? a. more food choices b. more freedom c. less work d. simpler lifestyle !

Who did the first work in creating vaccines