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  3. The answer, in one word, is aggression. Chipmunk species actively defend their ecological zones from encroachment by neighboring

The answer, in one word, is aggression. Chipmunk species actively defend their ecological zones from encroachment by neighboring

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问题     The answer, in one word, is aggression. Chipmunk species actively defend their ecological zones from encroachment by neighboring species. The yellow pine chipmunk is more aggressive than the sagebrush chipmunk, possibly because it is a bit larger. It successfully bullies its smaller evolutionary cousin, excluding it from the pine forests. Experiments have shown that the sagebrush chipmunk is physiologically able to live anywhere in the Sierra Nevada, from high alpine zones to the desert. The little creature is apparently restricted to the desert not because it is specialized to live only there but because that is the only habitat where none of the other chipmunk species can live. The fact that sagebrush chipmunks tolerate very warm temperatures makes them, and only them, able to live where they do. The sagebrush chipmunk essentially occupies its habitat by default. In one study, ecologists established that yellow pine chipmunks actively exclude sagebrush chipmunks from pine forests; the ecologists simply trapped all the yellow pine chipmunks in a section of forest and moved them out. Sagebrush chipmunks immediately moved in, but yellow pine chipmunks did not enter sagebrush desert when sagebrush chipmunks were removed.
Which of the following statements is supported by the results of the experiment described at the end of paragraph 5?
选项 A、The habitat of the yellow pine chipmunk is a desirable one to other species, but the habitat of the sagebrush chipmunk is not.
B、It was more difficult to remove sagebrush chipmunks from their habitat than it was to remove yellow pine chipmunks from theirs.
C、Yellow pine chipmunks and sagebrush chipmunks require the same environmental conditions in their habitats.
D、The temperature of the habitat is not an important factor to either the yellow pine chipmunk or the sagebrush chipmunk.
答案A
解析
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