Which of the following is an advantage of using Bt to control insects?
A. Bt does not accumulate in the soil or in nontarget animals.
B. Bt is easily degraded in the natural environment.
C. It is a rather new agent, being only a few years old, so insects have not had time to develop resistance.
D. Two of these are useful traits for the safe use of Bt to control insects.
Answer: D
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Of the following, which is the MOST common AIDS-associated opportunistic disease?
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