The mississippi-missouri river can be found in:

north america
europe
africa
south america
asia

A.) It can be found in "North America"

Hope this helps!

Answer// dinosaurs emerged during mesozoic era;

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!