To estimate the number of foxes in an area, a researcher conducted a mark-recapture survey. In the first survey, he caught and marked N number of foxes. In his second survey a week later, he caught 120 foxes of which 90 were unmarked (recaptures). If you are told that the actual number of foxes in this area is 400, what is value of N in this area?

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#Question id: 16781

#Section 3: Mathematics and Quantitative Ecology

At Dunkin Donuts the number of donut holes in a bag can vary. Help Donald find the mode. 12,10,10,10,13,12,11,13,10

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#Question id: 12148

#Section 1: Ecology

If asked to find the cause of regular fluctuations in a population's size not associated with seasonal environmental variation, you would probably first seek evidence for: 

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#Question id: 3444

#Section 2: Evolution

Which of the following is least related to the others?

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#Question id: 4601

#Section 2: Evolution

DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Instead, DDT is largely useless against many insects. Which of these would have prevented this evolution of DDT resistance in insect pests?

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#Question id: 11855

#General Aptitude

The least number which when divided by 5,6,7 and 8 leaves a reminder 3, but when divided by 9 leaves no reminder is.