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Chad Prescod 10/27/2010 Biology What empirical evidence did Darwin collect to help build his study of diversity? DNA 2. What is meant by the term descent with modification? The term Descent of Modification is the slow change that occurs in an ancestor species through an extended period of time. 3. Darwin also used the phrase natural selection. What does this mean? (Look it up) Natural Selection is the process by which the trait of a species becomes more or less in population due to the consistent effects upon the survival or reproduction of their bearers. 4. Since Darwin’s “On the Origin of Species” was published in 1859, which two examples of Empirical evidence is mentioned in the article as corroborating his hypothesis? 5. Why is evolution now considered theory rather than hypothesis? In science, a hypothesis and a theory is different from each other in that a hypothesis is an empirical observation or theoretical derivation that hasn’t been unproven or by any experimental work, and that a theory is a hypothesis that has been rigorously tested by many researchers and supported by strong evidence.