Which of the following is not a threat related to the Klamath-Siskiyou ecoregion?
a. logging
b. declining populations of spotted owls
c. oil and gas development
d. a newly introduced pathogen
c
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Increasing atmospheric carbon dioxide is
A) increasing sedimentation of C, Ca, and Si. B) increasing the effect of the biological pump. C) fueling increased primary production in ocean waters. D) acidifying the ocean and decreasing the rate of formation of calcareous shells.
Which of the following is not correct concerning Legionnaires' disease?
a. cases have been traced to the fallout from the Mount Saint Helen's Volcano b. symptoms include cough, diarrhea, and abdominal pain c. L. pneumophila lives in close associations with free-living Amoebas d. the disease is communicable from person-to-person e. it is more common in males over 50 years of age
Is there an "optimum" beak size for finches?
a) No, beak size in finches appears to be dependent on the amount of rainfall. b) Yes, sexual selection always selects for the largest beak size. c) Yes, larger beaks are always better for finches. d) Yes, smaller beaks are always better for finches. e) No, beak size stays the same, regardless of environmental factors.
Antibodies belong to a group of compounds called:
A. self-recognizing compounds B. virulent bases C. anti-steroids D. immunoglobulins