For your questions, here are the appropriate responses:
Question 1: Which of these would be used to measure population density?
Response: D - sq. kilometer
(This is because population density is typically measured as the number of people per unit area, commonly in square kilometers.)
Question 2: The dominant obstacle to population settlement in North Africa is the __________.
Response: C - Sahara Desert
(The Sahara Desert is the largest hot desert in the world and is a significant barrier to settlement in North Africa.)
Question 3: Most people in this region live close to __________.
Response: B - bodies of water
(Bodies of water are vital for survival and support agriculture, making them critical to human settlement.)
If you have more questions or need further assistance, feel free to ask!