The correct answer should be D. The classes are more challenging.
Whether something is challenging or not is not a benefit and is pretty subjective as something may be more or less challenging to different individuals.
Answer:
Andes Mountains
Explanation:
The Inca civilization was located in Cuzco. Cuzco is located in South America, with the Andes Mountains going through it.
Answer:
The Tigris and Euphrates rivers made it possible to grow wheat on the arid Mesopotamian plains, but the dry climate eventually defeated human engineering. Irrigation brought water to fields faster than it could drain out. As salt-rich groundwater rose and surface water evaporated, mineral salts built up in the soils. Farmers switched to more salt-tolerant grains like barley, but the harder they farmed, the less they harvested. After about 2,000 years, the once-fertile land of southern Mesopotamia was barren.
Explanation:
The first fireworks were invented in medieval china around the early 9th century
I would go with C. People in favor of state's rights