The most shallow soils occur in or on
A) steep slopes.
B) native grasslands.
C) valleys.
D) floodplains.
A
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Where a given species of vertebrate lives has dramatically shaped the evolution of respiratory adaptations, particularly since the oxygen concentration in air is approximately 20 times that of the oxygen concentration in water. Per unit area of gas exchange surface, which group of vertebrates can extract the greatest total amount of oxygen from the external medium?
A. fish B. mammals C. reptiles D. amphibians E. birds
Thermococcus litoralis and Thermus aquaticus are thermophilic bacteria that are
A. used as cloning vectors. B. genetically engineered bacteria. C. sources of heat-stable DNA polymerases. D. principal sources of restriction endonucleases.
Which of the following designations indicates a sex-linked trait?
A. XB B. A C. IA D. i E. a
Which of the following is the best line of evidence for glycolysis being an ancient pathway?
a. Glycolysis occurs in mitochondria. b. Glycolysis is universal. c. Glycolysis is highly regulated. d. Glycolysis is complicated.