Which three factors determine the ecological efficiencies of consumers?
a. assimilation and harvesting efficiencies, and nutrient volume
b. assimilation and harvesting efficiencies, and water volume
c. production, harvesting, and assimilation efficiencies
d. production and harvesting efficiencies, and amount of sunlight
e. production and harvesting efficiencies, and percentage of decomposers
ANSWER: c
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A typical root pumps out H+ to maintain a strong membrane potential of about
A. -12 V. B. 120 V. C. 60 Hz. D. -160 mV. E. pH 5.0.
As population density increases, the chance of
____ also increases.
a. pathogens b. parasitism c. predation d. competition e. all of these
Which drug is considered an hallucinogen?
a. marijuana b. nicotine c. cocaine d. morphine e. alcohol
Shawfiq must have a benign tumor removed from his brain. The surgeon tells him that only local anesthesia will be administered as she cuts through Shawfiq's scalp and that he will remain conscious the whole time. Shawfiq is really nervous about this
because the brain seems to be a very sensitive area to have surgery on, particularly while he is wide awake. Explain to him why he shouldn't be so nervous. What will be an ideal response?