“In chemistry, a chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components without breaking chemical bonds. Chemical substances can be solids, liquids, gases, or plasma.” from google
Answer:
C) much of Western Europe was United under a single ruler
Explanation:
Charmalagne began his campaign to obtain new territories for his new kingdom in the late 700s.
His conquests were successful. As soon as he defeat foreign territories, he transform them into one of their own and placed the Men he trust to take care of the new territories. In early 800s, he managed to unite the majority of western and central Europe under his rule, put it under the a new banner, which later on called the Holy Roman Empire.
D
The biggest problem was mosquitoes and rough terrain since mosquitoes would spread yellow fever and malaria causing many deaths and the rough terrain was extremely hard to terraform.
Answer:
The Anasazi built dwellings like pit houses, stacked pueblos, and cliff dwellings.