Vector-borne diseases
What will be an ideal response?
human illnesses caused by parasites, viruses and bacteria that are transmitted by mosquitoes, sandflies, triatomine bugs, blackflies, ticks, tsetse flies, mites, snails and lice
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Algal biofuels are considered viable alternatives to land-based crops such as corn and soybeans because ________.
A. algae do not compete with food production B. algae can be grown on wastewater C. growing algae does not require farmland D. All of these choices are correct. E. None of these choices is correct.
Terracing, contour farming, intercropping, and crop rotation all ________
A) are prohibited in organic farming B) are techniques for conserving soil resources and fertility C) contribute to erosion and desertification D) are aspects of IPM E) contribute to leaching
What does the principle of constant proportions tell us?
a) No matter where ocean salinity is measured, the result is the constant. b) No matter the salinity of ocean water, the ratios of major dissolved ions remain the same. c) The amount of chloride ions (Cl-) in ocean water is constant. d) If a major dissolved salt is removed from ocean water, and other salts increase to keep the salinity constant. e) Ocean water salts are dissolved ions.
All countries have an official language.
a. true b. false