In order to maintain ecological integrity and prevent depletion of biodiversity, conservation biologists recommend that a minimum of ____ of the globe's land be protected.
A. 5%
B. 10%
C. 12%
D. 20%
E. 30%
Answer: D
Environmental & Atmospheric Sciences
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A. between zero and the weight of the crate. B. equal to the weight of the crate. C. zero. D. none of the above
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Explain how the natural greenhouse effect occurs.
What will be an ideal response?
Environmental & Atmospheric Sciences
Biome composed of a coniferous and deciduous trees with a short summer.
A. pelagic B. pioneer community C. marsh D. euphotic E. boreal forest F. deciduous forest G. grassland H. desert I. tundra J. biochemical oxygen demand K. phytoplankton L. savanna M. littoral zone N. benthic O. periphyton
Environmental & Atmospheric Sciences
Steppe soils are usually low in organic matter
a. True b. False Indicate whether the statement is true or false
Environmental & Atmospheric Sciences