Maybe something to do with the wall. Maybe Mexicans building the wall, the wall that is meant to keep them out. Kinda messed up but that is definitely something we're dealing with now.
***hope this helps:) brainliest? ;)
Answer:
Mid-latitude steppe and desert climate, major climate type of the Köppen classification characterized by extremely variable temperature conditions, with annual means decreasing and annual ranges increasing poleward, and relatively little precipitation.
Explanation:
Option 'B' = changes in climate, had the greatest impact on pre-historic man.
Changes on the weather forced men to move periodically or cyclically, usually returning to their original location at various times. When they moved to colder climates, they would make clothing out of animal skins, to protect themselves. When the nomads learned how to plant, they didn't need to search for other places anymore.
