CO2 and other gases, which absorb the longer wavelengths of infrared light and radiated heat from Earth, are responsible for causing the
A. acid rain.
B. ozone layer depletion.
C. greenhouse effect.
D. decreased biodiversity.
Answer: C
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The cell junctions labeled “A” in the figure
a. prevent movement of materials between cells. b. are found in tissues subjected to stretching. c. allow the free passage of materials between cells. d. are found mostly in heart muscle. e. are found in most tissues except in the stomach.
Blanks “A” and “B” should be labeled respectively
a. does not drink; loss b. does not drink; gain c. drinks; loss d. drinks; gain e. none of these
All echinoderms are found:a
in marine habitats. b. in freshwater. c. on land. d. on the bottom of the ocean or lakes. e. in shallow ocean waters.
Who was the first scientist to pursue a "magic bullet" that could be used to treat infectious disease?
A) Jenner B) Pasteur C) Ehrlich D) Lister E) Semmelweis