Exponential and linear growth
If the population in each generation increases by a constant multiple and if, for example, it doubles in each generation, this is called exponential growth. Exponential growth is constantly faster – if there are ten individuals in the first generation, there will be twenty in the second, forty in the third, eighty in the fourth, etc. In contrast, linear growth occurs when the number increases by a constant amount in each generation, e.g. by 10 individuals. Linear growth occurs at a constant rate – if there are ten individuals in the first generation, there will be twenty in the second, thirty in the third, forty in the fourth, etc.
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