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Evolution Explained The most fundamental idea is that living things change in time. These changes can help the organism to survive, reproduce, or become more adaptable to its environment. Scientists have utilized genetics, a science that is new to explain how evolution happens. They have also used the physical science to determine how much energy is needed for these changes. Natural Selection To allow evolution to occur organisms must be able to reproduce and pass their genes on to the next generation. Natural selection is sometimes referred to as "survival f