Answer:
May I please know what you are referring to and I will edit my answer
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Explanation:
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Industrialization created new jobs which helped to cause Urbanization, transportation and communication allowed goods to move to new markets, steamboat moved goods and people quickly, manufacturing, raw materials, and Bessemer steel process improved productivity.
Sources are used in a paper to show what ideas inspired you and whose theories you would be using and you cite the sources in order to avoid plagiarism. If you don't have sources, your paper will not be valid and you could get accused of plagiarism. The more sources you use the better but you should keep in mind that they need to be important for the paper and used with a purpose and not just to increase the number of sources.
He wanted to find a direct water route from West Europe to Asia
Lind's experiments at sea tested some potential cures for scurvy. His experiments were important because he discovered the use of citrus fruit as a cure for scurvy. It ranks as one of the first clinical experiments in the history of medicine.