Answer:
A.
Explanation
Kublai Khan contributed to the fast growth of China's economy by reopening and enhancing trade routes. He reformed China's political structure to have a closed social hierarchy. His dynasty, the Yuan Dynasty (1271-1368), led to the development of Chinese literature and architectural style.
A. valuable
it did many good things for people and provided many special and great reasources
The word that comes in the blank is "evolutionary".
Evolutionary explanations of aggression propose that aggression serves a vital capacity as far as both individual survival and in addition regenerative potential. Rivalry emerges when assets are constrained and creatures must contend with a specific end goal to survive and repeat.
Please write more - it is not possible to answer.
Sorry nobody can answer this without context. Which means we have no idea what book this is from or the reading context