Toxic organic compounds that contaminate soils are an environmental problem because they may:
A) contaminate or be taken up by plants and so cause toxic effects to animals or people eating the plants.
B) leach to groundwater cause toxic effects in drinking water or aquatic ecosystems.
C) kill or inhibit soil organisms (other than any pest targeted).
D) kill or injure plants (other than any target weeds).
E) all of the above
E
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____ systems provide horizontal transportation for distances beyond the practical limits of moving walks.
A. Pneumatic tube B. Conveyor C. Crane D. Shuttle transit
An agribusiness firm may undertake three alternatives: buy cane sugar and manufacture various sugars and sweets, making a profit of $12 million; buy corn and produce ethanol, making a profit of $16 million; or buy wheat and produce breads, rolls, and pastries, making a profit of $13 million. The opportunity cost associated with these three choices is
A) $13 million. B) $4 million. C) $16 million. D) $3 million.
CO2 is a greenhouse gas that traps heat in the atmosphere.
Answer the following statement true (T) or false (F)
In a(n) ____ gate, a 1 occurs only when 0 is applied to both inputs. A 1 input produces a 0 output.
A. XNOR B. XOR C. NOR D. NAND