What physical feature once served as a natural boundary to western expansion? Group of answer choices

the Mississippi River

the Great Plains

the Great Lakes

the Appalachian Mountains

How many countries have portuguese as a national language?

Which of the following is an example of a policy that may be implemented by a business that has trouble with employees using the internet for their own personal needs? a. all employees will have to take a safety training class. b. employees caught using the internet for personal needs will have to take a professional development class. c. personal interviews will be conducted to find out who is using the internet for personal needs. d. employees will be monitored, but nothing will happen if their employer catches them using the internet for personal needs.

Whats the biggest sea in the world?