The main source of electromagnetic waves is vibrating
A. molecules.
B. electric charges.
C. atoms.
D. energy fields.
Answer: B
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Arriving at the hotel for the meeting, a woman decides to get a workout in the pool. Upon stepping into the pool area, she quickly finds it difficult to breathe because of the high levels of chlorine in the air above the pool
This woman is experiencing A) a lethal reaction to the chlorine in the air. B) a chronic reaction to the chlorine in the air. C) an acute reaction to the chlorine in the air. D) a carcinogenic reaction to the chlorine in the air.
Which of the following amino acids will exist as a + 2 ion at very low pH?
A) arginine B) glutamic acid C) isoleucine D) none of these
A monocultural agriculture community is
A) not stable, but resilient B) neither stable nor resilient C) stable, but not resilient D) both stable and resilient E) moderately stable and resilient if agriculturalists take proper measures.
What resulted in most of the damage during the 1906 San Francisco earthquake?
A. liquefaction B. tsunami C. ground failure D. fire