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In 1978, a drought on the Galapagos Islands caused a reduction in the production of seeds that one of Darwin's finches, a kind of bird, fed upon. This caused a decrease from 1,400 to 200 birds. This population change factor


A) would not be considered a part of the carrying capacity for these birds.
B) was density-dependent.
C) was density-independent.
D) resulted in exponential growth for the bird population.

E) B) and D)
F) A) and B)

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Which of the following statements about carrying capacity is true?


A) An S-shaped curve represents a population's ability to increase its numbers above the carrying capacity of its habitat.
B) J-shaped curves show the immediate limiting effect of carrying capacity on a newly introduced organism.
C) The carrying capacity is the same for all organisms in the same area.
D) The carrying capacity is established by the factor with the most limited availability.

E) C) and D)
F) None of the above

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Why is the March 2013 merger of the National Population and Family Planning Commission and the Ministry of Health considered significant?


A) The merger allowed documents recording births to be housed within a single agency.
B) The merger signified that births were being restricted primarily for health reasons.
C) The merger was a concession to demands from rural workers.
D) The merger was a sign of demotion for the National Population and Family Planning Commission.

E) B) and C)
F) All of the above

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A population of 10 yeast cells is put into a flask with growth media that contains all of the nutrients required for growth. The yeast has a doubling time of two hours; four hours after adding the yeast to the flask the population size is 40 cells. After three days the population size stabilizes at around 500 cells. Is this population exhibiting logistic or exponential growth? Explain your reasoning.

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This population is exhibiting logistic g...

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Population size ________ when the combination of death and emigration rates is lower than the combination of birth and immigration rates.

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