because it is a new virus that us humans have not experienced and we are still learning about it
They are descended from wild plants.
18% of 400 is 72
Hope it helped
The could tell by solar radiation and dark matter, they didnt know were dark matter was but they new it was there
Answer: The Dust Bowl was caused by several economic and agricultural factors, including federal land policies, changes in regional weather, farm economics and other cultural factors. After the Civil War, a series of federal land acts coaxed pioneers westward by incentivizing farming in the Great Plains.
Explanation:
1) Manifest Destiny: The US Government wanted settlers to move onto the Plains as they needed the land to be settled and farmed and for communities and towns to grow up and expand. This was needed if the USA was to be a rich and successful country. The government therefore promoted the idea of Manifest Destiny.
