In Some Areas,cattle on an Open Range May Compact Fragile

question 15

Multiple Choice

In some areas,cattle on an open range may compact fragile soils while grazing.This can damage plant roots,leading to fewer,smaller plants,which may in turn cause cattle to graze more and work harder to obtain food.This is an example of a ______________ .

• A)positive feedback loop
• B)dynamic equilibrium
• C)food web
• D)negative feedback loop
• E)homeostatic system

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Definitions:

Variables Controlled

In experiments, these are the factors that researchers keep constant to prevent them from influencing the outcome of the study.

Confounding Variable

An external variable that influences both the dependent and independent variables, making the relationship between them less clear.

Illegal Drug Use

The consumption of substances that are prohibited by law.

Proxy Variable

An alternative that is used to stand in for a variable that cannot be directly measured or is not readily available.