A population of 1000 mice living in a barn of land loses one half of its members when a sudden a virus spreads through the population.This population has undergone a reduction in population size due to

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Disease is a density dependent factor and it acts more heavily on a population that is more crowded over one that is less crowded. If the population had contained 500 individuals rather than 1000 it might not have had loses that were as severe.Bloom's

A Population of 1000 Mice Living in a Barn of Land