What did Stephen Carter and his team from University of Madison-Wisconsin study?
a. salt water intrusion into estuaries
b. tipping points for endangered food webs
c. acidification of ocean ecosystems
d. effects of dams on river flow
e. desertification of dune ecosystems
b
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Hybrid breakdown is characterized by:
a. sterility of the progeny of hybrid individuals. b. sterility of hybrid adults. c. death during pregnancy of hybrid females. d. death during early life of hybrid embryos. e. early death of hybrid embryos.
Nitrification ____.
A. converts ammonium into nitrates B. reduces nitrates to nitrites C. converts nitrogenous compounds into free nitrogen D. converts atmospheric nitrogen to ammonia E. reduces ammonia to ammonium
What feature is common to all the alveolates?
A. Autotrophy B. Lung-like sacs used for respiration C. Bioluminescence D. Complex life cycle with two hosts E. Membrane-bound sacs beneath the plasma membrane
When bone marrow stem cells are removed from the patient, infected with a virus that carries a normal gene, and returned to the patient, this is an example of
A. ex vivo gene therapy. B. viral disinfection. C. chemotherapy. D. PCR. E. in vivo gene therapy.