Which one of the following pairs would be classified as isotopes of each other?
A. H and H+
B. Na+ and Cl-
C. C and Si
D. 12C and 13C
E. H and H+, Na+ and Cl-, C and Si, 12C and 13C
Answer: D
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In the circulatory system of a frog, the _____ circulation supplies the body tissues, while the ______ circulation supplies the respiratory surfaces.
A. systemic, pulmocutaneous B. pulmocutaneous, systemic C. systemic, cutaneous D. pulmocutaneous, systolic E. None of the choices for this question are correct.
Which of the following is not one of the five classes of antibodies?
What will be an ideal response?
The first wildlife refuges were established in the United States shortly after 1960.
a. true b. false
An apparent departure from the rule that species diversity increases toward lower latitudes is the decrease in species of mammals as one moves southward on the peninsula of Baja California. What factor might account for this southward decline?
A) increased intensity of competition B) increased intensity of predation C) increased dispersal distance from the continental source of species