Many species of field mice are able to reproduce several times a year and produce litters with multiple offspring. However, an ecologist noted that the population size of mice, as measured in a California grassland, did not change from year to year. The factors that keep natural populations from increasing are collectively called:

Question

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The fact that the population size of mice did not change from year to year suggests that the population is being held in check by factors that limit its growth, such as limited resources or predation. These factors are collectively known as environmental resistance.

Many Species of Field Mice Are Able to Reproduce Several