What causes the nitrogen and the oxygen in the air to combine and form oxides of nitrogen?
A) Chemical reaction in the catalytic converter B) Any spark
C) Heat above 2500°F (1370°C) D) Sunlight
C
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____ current power source provides a voltage whose polarity and output voltage never change direction.
a. Alternating b. Direct c. Transformer d. Electric
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Eli Whitney was instrumental in the invention of the
A. steamboat. B. cotton gin. C. railroad locomotive. D. telegraph. E. repeating revolver.
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Why is there such concern about the use of diethylstilbestrol (DES)?
What will be an ideal response?
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Which type of cell controls the opening and closing of stomata?
a. pericycle c. mesophyll b. cortex d. guard
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