The arctic fox was once the most common fox on the Northern Island. Recently, the number of red fox on the island surpassed, for the first time, that of the arctic fox. Nonetheless, both foxes eat the same prey and share the same environment.
Which of the following, if true, could best account for the decrease in arctic fox relative to the red fox?
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AThe red fox is able to digest food faster than the arctic fox can
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BThe polar bear, the arctic fox`s primary predator, has become increasingly less common on the island.
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COn the most northern part of the island, the number of arctic fox still exceeds the number of red fox.
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DBecause the arctic fox tends to live longer than the red fox, a greater percent of arctic fox are able to procreate than are the red fox.
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EAs a result of increased temperatures, much of the snow that had provided camouflage to the arctic fox is now gone.
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正确答案: E