In an aquatic ecosystem, a secondary carnivore is temporarily excluded and then, after a period of time, is returned. Which one of the following is not an expected top-down effect after it is returned?

A. Primary productivity increases.
B. Algae decrease.
C. Herbivores become more abundant.
D. Primary carnivores become less abundant.


Answer: A

Biology & Microbiology

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A) the effect of a housing development on a spotted salamander population in a vernal pool B) the effect of changing availability of acorns on a population of squirrels C) the effect of a red tide outbreak on sea birds in the area D) the effect of a hormone on the rate of blood vessel formation

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Refer to the accompanying figure. The chorion is identified by number:a

1. b. 2. c. 3. d. 4. e. 5.

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Based on the temperature range and precipitation, which area in the accompanying figure is dominated by pine trees?

a. 3 b. 4 c. 5 d. 6 e. 7

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Which of the following statements is true about the decolorizing step for the acid-fast stain?

A) Because acid-fast bacteria have a waxy cell wall that resists decolorization by the acetone-alcohol rinse, they appear a deep blue at the end of the procedure. B) Over-decolorizing can lead to false-positive results. C) Acetone-alcohol solution is the decolorizing agent. D) The decolorizing step is the differentiating step. E) Non-acid-fast bacteria appear bright pink-red at the end of the procedure.

Biology & Microbiology