Here are the answers to your questions:
Question 1
A) Why is the region of Eurasia home to 80 percent of humanity?
Answer: Temperate climates support agriculture.
Question 2
A) Why do many human civilizations settle in lowlands?
Answer: It is easier to live on continuous flat land.
Question 3
A) List the four categories of industry that describe the work of people in society.
Answer: primary, secondary, tertiary, quaternary
Question 4
A) Which of the following nations is one of the top trading partners for German exports?
Answer: United Kingdom