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Insert the most suitable term in each blank. Individuals in a population have high ................................ potential, yet population size stays roughly ................................ . This is because many die as a result of environmental factors and so fail to reproduce. There is ................................ among members of a population, and those with characteristics best suited to the environment survive. They may reproduce and pass on their ................................ to their offspring. This can bring about a change in the ................................ pool of the population and, over time, may result in evolutionary change.