Experiments conducted by Francisco Ayala with fruit flies and by David Pimentel with houseflies and blowflies have demonstrated the rather interesting phenomenon that __________.

#Question id: 12312

#Section 1: Ecology

#Question id: 10615

#Section 2: Evolution

The population size of a bird increased from 600 to 700 in one year. If the per capita birth rate of this population is 0.50, what is its per capita death rate?

#Question id: 9213

#Section 2: Evolution

Suppose you attend a town meeting at which some experts tell the audience that they have performed a cost-benefit analysis of a proposed transit system that would probably reduce overall air pollution and fossil fuel consumption. The analysis, however, reveals that ticket prices will not cover the cost of operating the system when fuel, wages, and equipment are taken into account. As a biologist, you know that if ecosystem services had been included in the analysis, the experts might have arrived at a different answer. Why are ecosystem services rarely included in economic analyses?

#Question id: 12153

#Section 1: Ecology

#Question id: 12346

#Section 1: Ecology

The schematic below shows the relationship between survivorship with age (relative to maximum lifespan) in Species 1 (dashed line) and Species 2 (solid line). Which of the following inferences is compatible with this figure?