Worldwide declines in the population size of frogs have recently been linked to ____

a. overharvesting
b. a fungus


c. dams
d. decreases in global temperatures
e. increases in precipitation


ANSWER: b

Biology & Microbiology

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Which of the following is NOT a correct match?

a. hydrosphere; ice caps b. lithosphere; airborne particles c. atmosphere; gases d. hydrosphere; rivers e. lithosphere; Earth’s crust

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The most dangerous arrhythmia is

a. ventricular tachycardia. b. ventricular bradycardia. c. ventricular flutter. d. atrial fibrillation. e. ventricular fibrillation.

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In Experimental Condition 2 of the accompanying figure, the distribution of Chthamalus suggests that:a

interspecific competition kept Chthamalus from extending lower into the intertidal area. b. intraspecific competition kept Chthamalus from extending lower into the intertidal area. c. a limiting factor kept Chthamalus from extending lower into the intertidal area. d. a barnacle parasite kept Chthamalus from extending lower into the intertidal area. e. predation kept Chthamalus from extending lower into the intertidal area.

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Which cells produce specific antibodies?

A. Macrophages B. Monocytes C. T cells D. B cells E. Plasma cells

Biology & Microbiology