Biology: Life on Earth
Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Chapter 26, Problem 1FTB

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Two examples of density-independent forms of environmental resistance are________ and __________. Two important types of density- dependent environmental resistance are__________ and__________. LO4

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Summary Introduction

To review:

The given blank space in the statement, “Two example of density-independent forms of environmental resistance are ________ and _______. Two important types of density-dependent environmental resistance are _____ and __________.”

Introduction:

Environmental resistance acts as a means to regulate the population size in any given area, below or equal to the carrying capacity. There are mainly two types of environmental resistances, namely density-dependent and density-independent.

Explanation of Solution

Density-dependent resistance depends on the population density of any area. They mainly include factors such as any essential requirements, lack of which could lead to a decline in population, for example, food, nutrients, and space. Certain interactions such as predation and competition also arise due to rise in population and thus form a part of the density-dependent resistance.

Density-independent resistance acts independently from population density. They mainly include natural disasters and extreme climatic changes, which lead to drastic effects on population size. For example, flood, fire, storm, drought, habitat destruction, and freezing.

Conclusion

The given blank space in the statement, “Two example of density-independent forms of environmental resistance are fire and drought. Two important types of density-dependent environmental resistance are nutrient and space.”

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