Knowledge of genetics did not yet exist in Darwin's time, so genetic theory has since been used to explain natural selection. In addition, Darwin believed that evolution progressed at a slow, steady rate. However, that idea has been replaced by the punctuated equilibrium model, in which major changes in brief spurts.
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Green plants and trees use photosynthesis to make food from sunlight, carbon dioxide and water in the atmosphere: It is their primary source of energy. The importance of photosynthesis in our life is the oxygen it produces. Without photosynthesis there would be little to no oxygen on the planet.
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Ginger? i do not understand your question