During half the 1800s, the south economy relies on the plantation system. Thus the correct answer is D.
<h3>What is the economy?</h3>
An economy of the country is defined as the production and consumption of goods taking place in a country that determines the purchasing parity of individuals and the flow of cash in the market.
The plantation system mainly refers to agricultural activities where crop production will be done and crops sells in the market. Mainly cotton was the most profitable for selling in the market.
The cost invested in doing plantation was lower than the profit achieved. Therefore, option D is appropriate.
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Technological innovations like desalination allowed people living in areas without adequate freshwater sources to adapt to their environment because desalination allows people to live, grow food, and mine natural resources in regions without many freshwater resources.
Desalination is that the process of removing salts or other minerals and contaminants from seawater, brackish water, and wastewater effluent and it's an increasingly common solution to get water for human consumption and for domestic/industrial utilization.
Desalination uses reverse osmosis technology to remove water molecules from seawater.
Desalination could be a process that takes away mineral elements from saline water.
The process is named "desalination", and it's being employed more and more round the world to grant people with needed freshwater.
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Answer:
In the 1930s, a serious drought, combined with excessively intensive farming practices, transformed the U.S. Great Plains into a dust bowl, wreaking economic devastation on farmers and their communities. The fertile topsoil that fed a nation was, quite literally, blowing in the wind. 
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Answer: Using the military to protect U.S. interests
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- Discovery and Development
where drug begin to be researched in laboratory
- Preclinical Reserach
Involve animal testing for the drugs
- Clinical testing
the drugs began to be tested to people to find out if it's safe
- FDA Review
FDA carefully examined the data that had been collected
- FDA Post-Market Safety monitoring.