Answer:
I think they make U-shaped valleys but I don't know if there is a specific name for it
Explanation:
<span>It was a russian world war two tank</span>
Red) writing
led to them creating cuneiform
The correct answer is Malaria
Malaria was a huge problem since it couldn't be treated and people mostly died from it. It prevented numerous explorers from venturing into places like Africa where Malaria was running rampant due to the huge amount of mosquitoes. When it was discovered, it enabled numerous people to live at ease because they could not live with the disease or prevent getting it.
