The logistic model of population growth takes into account ...

The logistic model of population growth takes into account __________ , but not __________.
a. density-dependent factors; density-independent factors
b. density-independent factors; density-dependent factors

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Key Concepts

Density-Independent Factors

Density-independent factors affect population growth regardless of the population's density. These include environmental events like natural disasters, weather extremes, and climate conditions. Unlike density-dependent factors, density-independent factors are not considered in the logistic growth model since they impact populations uniformly, irrespective of their size.

Logistic Growth Model

The logistic growth model is a mathematical representation of population growth that incorporates the concept of a carrying capacity, which limits population size. Unlike exponential models, the logistic model assumes that as population density increases, the growth rate slows due to resource limitations, leading eventually to a steady state when the carrying capacity is reached.

Density-Dependent Factors

Density-dependent factors are influences that vary with population density. As a population grows, these factors such as competition for resources, predation, disease, and waste accumulation intensify, ultimately reducing the per capita growth rate. The logistic model accounts for these factors by reducing growth as the population nears its carrying capacity.

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