What President Roosevelt did which has never been done before in conservation was that the president made conservation a major part of his administration. He was a dynamic force in the new movement which was known as conservationism. The president saw the need to preserve natural resources and he put in place appropriate mechanisms to do this. At the end of his tenure, he had already built five national parks, four game refugees, fifty one national bird reservations and national forest service.
Which was Charles Darwin known for? He proposed the theory of "natural selection," which said that all living things change over time.
Charles Darwin discovered a lot in the Biology section of Science.
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Lacking food and ravaged by smallpox disease earlier introduced by one of the Spaniards, the Aztecs, now led by Cuauhtemoc, finally collapsed after 93 days of resistance on the fateful day of 13th of August, 1521 CE. Tenochtitlan was sacked and its monuments destroyed
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