When the Croton system first started on July 4, 1842, it was the only source of water. According to David Soll, as New York City's population grew, so did the demand for clean waterworks system in New York city.
<h3>Who was David Soll?</h3>
- Professor of biology at the University of Iowa, David R. Soll. He is most recognized for his work on monoclonal antibody technology, phenotypic flipping in Candida albicans, and motion analysis of living cells.
- He oversaw the WM Keck Dynamic Image Analysis Facility from 1985 to 2021 and the Developmental Studies Hybridoma Bank from 1995 to 2021.
- Since 2006, he has become a Fellow of the American Association for the Advancement of Science and the American Academy of Microbiology.
- He has started four businesses, written more than 400 articles in various sectors of biomedicine, earned more than 78 grants and contracts, and serves on many editorial boards for prestigious scientific journals.
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Answer:so there was Pangaea, Pangaea split due to the movement of the tectonic plates about 250 years ago and this was South America and Africa
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The passage of the fifteenth amendment led to the establishment of long-awaited true political equality.
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- The Fifteenth Amendment that was done to the United States Constitution guaranteed the African Americans the right to vote in the elections conducted thenceforth.
- Before the passing of the Fifteenth Amendment, the blacks of the African Americans were deemed to be politically untouchable.
- The Fifteenth Amendment allowed blacks to choose their own representatives as it clarified that no one would be denied the right to vote based on race, color, or previous condition of servitude.