Which two Characters are used to classify stars on the hertzsprung-Russell diagram

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory

Southeast asia relies on its many because of the volcanic, mountainous terrain. a. highways c. rivers b. airports d. lakes

Write a 150word essay describing the effect of people's activities on the environment in the region.