Answer:
D
Explanation:
The population density= the number of people in a population divided by the size of the place they live.
I think the answer is economic opportunity
I believe it is Gila river, San Juan river, The Green River, and the Gunnison river.
There was some intelligence causing the movement of the plates and that the intelligence entity had a purpose in placing the plates in motion.
I hope this helps.
I want to say the answer is Tribalism.
Please know i am not CERTAIN this is the answer, but it is similar to a question i had. (Tribalism was the answer)