Fishing in the river will likely lead to ____ because of which of the following reasons? ? All fishermen will choose to fish in the brook believing that there are more fish there. ? Nobody will enjoy fishing because of the lack of private contributions to the maintenance of the river. ? All fishermen will choose to fish in the river because of the limited access to the brook. ? Anyone can fish in the river, and one person's fishing activity decreases the ability of someone else to fish with success.
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A dam is built that separates a river into two sections - a deep upstream section and a shallow downstream section. When the dam is first built, a fish species is able to move from the upstream section into the downstream section, but not vice versa. Predators can more easily catch the fish in the shallow downstream section than they can in the deep upstream section. Which scenario is most likely to lead to speciation? A. The fish population contains individuals with effective predation evasive traits and eventual changes to the dam prevent fish from moving downstream. B. The fish completely lack any effective predation evasive traits across the entire population, move infrequently from upstream to downstream locations, and reproduce with low frequency. C. The fish reproduce with high frequency, move with high frequency from upstream to downstream locations, and have a robust set of predation evasive traits across the entire population. D. The rate of upstream fish entering the downstream section decreases over time without being completely shut off, and many of these fish carry predation evasive traits.
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A farming community is experiencing an extended drought. Due to this, the community is low on water. The local and state governments decide to build a dam on a local river. One of the benefits for the farmers is that the dam will create a reservoir, which the farmers can use to irrigate their crops. How could the dam affect the resources of the local watershed? Check all that apply. A) Fish would not be able to migrate up the river to reproduce. B) Sediment carried by the flowing river would get trapped. C) There would be more space for forest growth. D) The number of habitats for local wildlife would increase. E) Birds that depend on fish may go hungry.
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Suppose Fischer Pond is a common-property resource—anyone can fish without having to pay for access. Locke Lake is privately owned—people who want to fish must purchase one of a limited number of permits from the lake's owner each season. According to the incentives that private ownership creates, which of the following would you expect to happen? Check all that apply. The owner of Locke Lake is likely to keep the lake clean and unpolluted. The owner of Locke Lake is likely to limit the number of fishing permits in order to maintain a plentiful stock of fish. Fischer Pond is less likely to experience a dwindling stock of fish each season.
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