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In 1838 Matthias Schleiden had stated that plant tissues were composed of cells. Schwann demonstrated the same fact for animal tissues, and in 1839 concluded that all tissues are made up of cells: this laid the foundations for the cell theory. Schwann also worked on fermentation and discovered the enzyme pepsin.
I believe this question may be for science, but here is the best answer i can give for that question.
These are the three factors that I had came up with regarding European Imperalism.
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Systematic European colonization began in 1492, when a Spanish expedition headed by the Italian explorer Christopher Columbus sailed west to find a new trade route to the Far East but inadvertently landed in what came to be known to Europeans as the "New World". He ran aground on 5 December 1492 on the island of Cat Island in The Bahamas, which the Lucayan people had inhabited since the 9th century; the site became the first permanent European settlement in the Americas. Western European conques
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