Scientists talk about evolution as a theory, for instance, just as they talk about Einstein’s explanation of gravity as a theory. As a hypothetical example, Darwin used North American black bears, which were known to catch insects by swimming in the water with their mouths open:\"I can see no difficulty in a race of bears being rendered, by natural selection, more aquatic in their structure and habits, with larg… Theory of Evolution. You won’t evolve over the span of your life. Evolution … The theory of evolution is one of the fundamental keystones of modern biological theory. When it comes to the evolution of life, various philosophers and scientists, including an … All species crawling around today are a product of it. Everything alive today are survivors of 3.6 billion years of evolution and natural selection. In the first edition of \"On the Origin of Species\" in 1859, Charles Darwin speculated about how natural selection could cause a land mammal to turn into a whale. From bacteria to humans, everything has evolved through just as much time. Evolution, theory in biology postulating that the various types of plants, animals, and other living things on Earth have their origin in other preexisting types and that the distinguishable differences are due to modifications in successive generations. Both mutations and natural selection have shaped who we are. Instead it takes generations. A theory is an idea about how something in nature works that has gone through rigorous testing through observations and experiments designed to prove the idea right or wrong. Evolution takes time.
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