<span>Sumerians built walls using the natural resource they were surrounded with, which was namely clay. They used this clay to create fired mud-bricks, as there was not any other building stone available at the time. However, the clay mud-bricks proved to be a solid structure for town fortification.</span>
This is more of a personal question about how well you know yourself, no one can answer this for you.
Explanation:
no link. sorry I can't help
Answer:
D. The profit motive drives companies that are competing in the global marketplace to exploit natural resources.
The menstrual<span> cycle </span>occurs<span> due to the rise and fall of hormones</span>
