An aging population, a high infertility, and a lack of food and water.
Letter C sounds the best to me!
Mounds is named after small hills
Answer:
(you have to copy and paste into the browser and I had to space out so brainly would let me post I hope you do well on the assignment)
Explanation:
h t t p s : / / w w w . y o u t u b e . c o m / w a t c h ? v = d Q w 4 w 9 W g X c Q