In natural ecosystems, what types of organisms feed off pest species and control the pest populations?

A. prey
B. rodents
C. pesticides
D. natural enemies
E. insects


Answer: D

Environmental & Atmospheric Sciences

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Which main-sequence stars are the least massive?

A) yellow B) orange C) blue D) red

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The niche of a species is the functional role of that species in the community that it belongs to

Species that have narrow niches (have very specific resource requirements) are said to be ________, while species that have broad niches (able to use a wide array of resources) are known as ________. A) Type 2 species; Type 3 species B) widespread; restricted C) r-selected species; K-selected species D) specialists; generalists E) generalists; specialists

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Moose, lynx, and burrowing rodent species are most likely found in which of the following?

A. temperate grasslands B. deserts C. boreal forests D. tropical forests E. savannahs

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Synergistic health risks are associated with a person who smokes and

A) delivers mail in a farming community. B) works inside of an office building. C) works in a coal mine. D) jogs in a park for exercise.

Environmental & Atmospheric Sciences