Agrosystems are prone to nutrient losses because of all the following reasons except ________
A) the water cycle breaks down
B) low crop biodiversity in a given field
C) leaching as a result of irrigation
D) plowing of crops
E) plants are harvested
A
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About how many kilometers (miles) is it from the center of Earth to the outer edge of the outer core?
A) 12,523 kilometers (7,827 miles) B) 6,370 kilometers (3,980 miles) C) 1,264 kilometers (790 miles) D) 2,880 kilometers (1,800 miles)
Nitrogen and phosphorus are referred to as macronutrients because ________
A) they are required in large amounts for organisms to survive B) their cycles have larger reservoirs than those of micronutrients C) they are larger than other nutrients needed by plants D) they are needed to manufacture large biomolecules E) they are needed by large organisms
The Antarctic Protection Act of 1990
A. establishes guidelines for mineral-resource development in Antarctica. B. sets the maximum allowable levels for Antarctic air and water pollution. C. protects the Antarctic flora and fauna. D. prohibits Antarctic mineral prospecting and development by United States citizens and companies.
World food production has doubled in the last 40 years because of
A. genetic modifications, DNA fingerprinting, and international treaties. B. organic farming practices, erosion control, and farm labor. C. diseases, world trade, and new sources of water. D. fertilizers, pesticides, and high-yielding varieties.