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Which of the following is NOT a density-dependent factor?

a.) A decline in the milkweed plant, which is the host plant for the Monarch butterfly
b.) An epidemic of the canine parvovirus in a wolf population
c.) An increase in native prairie grasses that produce seeds eaten by Bobwhite quail
d.) Moose, the primary food source for wolves on Isle Royale, experience a population crash
e.) A pesticide is applied to a population of aphids on a rose bush

Answer :

Final answer:

The density-independent factor among the given options is the application of pesticides to a population of aphids on a rose bush. This is because pesticides affect populations, regardless of their size or density.

Explanation:

The answer to your question which is NOT a density-dependent factor is e) a pesticide is applied to a population of aphids on a rose bush. Density-dependant factors are factors where the effect on the size or growth of the population varies with the population density. This includes factors such as competition, predation, disease, and food availability (a, b, c, and d) which are dependent on population size. In contrast, pesticide application (e) is a density-independent factor, as it affects the populations regardless of their size and density.

Learn more about Density-Dependent Factors here:

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