All of the following may be considered as sites for secondary succession EXCEPT

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#Question id: 12146

#Section 1: Ecology

Which of the following is not a density-dependent factor? 

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#Question id: 4932

#Section 2: Evolution

Which of the following is the best hypothesis regarding origins of nucleic acids?

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#Question id: 3358

#Section 2: Evolution

Populations with low effective sizes are susceptible to all of the following except

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#Question id: 16881

#Section 3: Mathematics and Quantitative Ecology

Null and alternative hypotheses are statements about:

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#Question id: 12100

#Section 1: Ecology

Prairie dogs once covered the expanses of the Great Plains. Their grazing made the grass more nutritious for the huge herds of bison, and a variety of snakes, raptors, and mammals   preyed on the rodents. In fact, the black- footed ferret (now endangered) specialized in prairie dog predation. Today, growing housing and agricultural developments have covered many prairie dog towns. Which of the following statements about prairie dogs is true?