A lake that is supplied with a large amount of phosphorus is likely to
a. be devoid of living organisms.
b. support large numbers of fish.
c. be crystal clear.
d. become eutrophic.
e. support many feeding levels.
D
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Which of the following represents a double-blind study?
A. The test group knows whether they are receiving a placebo or the actual treatment, and so do the researchers. B. The test group knows whether they are receiving a placebo or the actual treatment, but the researchers do not know until all the data are collected. C. The test group does not know whether they are receiving a placebo or the actual treatment, but the researchers do. D. Neither the test group nor the researchers know whether the test group is receiving a placebo or the actual treatment until all the data are collected.
A women has a fever, sore throat, and fatigue. She thinks she has the West Nile virus, but has not been to a doctor to conform her diagnosis. She is considered a:
a. Primary case b. Index case c. Secondary case d. Suspect case
Which of the following is mismatched?
A) epiglottitis — Haemophilus B) Q fever — Rickettsia C) psittacosis — Chlamydia D) whooping cough — Bordetella E) melioidosis — Burkholderia
Which is at the beginning of a grazing food web?
A. beetles B. detritus C. earthworms D. leaves E. shrews