GRE课程
In North America, crows have historically antagonized humans by ravaging corn crops, but advancing urbanization has recently made humans more tolerant of crows, and crows’ wariness has accordingly diminished. The future demeanor of the American crow (Corvus brachyrhynchos) is suggested by intercontinental analogy to india’s house crow (Corvus splendens) which has lived for many centuries in an essentially unarmed, animal-friendly, and densely populated culture Its audacity extends to stealing food from street vendors and entering dwellings to remove food from the table. The extreme watchfulness of the American crow has grown out of a long history of persecution. As people treat crows with insouciance rather than aggressionless wanness results in reproductive success, and another kind of corvine conduct asserts itself.
Which of the following generalizations most directly underlies the authors central point?
Two different species of the same genus of birds may differ greatly in their characteristic behavior for reasons that have nothing to do with the environment in which they live.
Degrees of wariness tend to differ significantly among individuals of the same animal species as well as between different species within the same genus
As human populations become more urbanized humans become less attuned to the behavior of animals in their environment in ways that can negatively affect animals’ reproductive success.
A given behavioral trait can have either a positive or negative effect on an animal’s reproductive success depending on the behavior of humans in the animal’s environment.
Human attitudes toward a given animal species tend to be somewhat arbitrary and are subject to change over time.
Select one answer choice.
