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Evolution Explained The most basic concept is that living things change in time. These changes help the organism to survive or reproduce better, or to adapt to its environment. Scientists have employed genetics, a science that is new, to explain how evolution happens. They also utilized the physical science to determine how much energy is needed for these changes. Natural Selection To allow evolution to take place, organisms must be capable of reproducing and passing their genetic traits on to future generations. This is the process of natural selection, often d