If we had no cilia in our trachea, our lungs would be filled with dust and microorganisms that we breathe in.
Explanation: The basic building block of nucleic acid polymers; an organic compound made up of a nitrogenous base, a sugar, and a phosphate group.
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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.