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考研英语阅读理解模拟试题及解析(五)]由[乐教网]提供下载交流学习，版权归原作者所有，大小为393 KB，
ngle the environmental and biological factors that hold this intrinsic capacity for population growth in check over the long run. the great variety of dynamic behaviors exhibited by different population makes this task more difficult： some populations remain roughly constant from year to year； others exhibit regular cycles of abundance and scarcity； still others vary wildly， with outbreaks and crashes that are in some cases plainly correlated with the weather， and in other cases not.
to impose some order on this kaleidoscope of patterns， one school of thought proposes dividing populations into two groups. these ecologists posit that the relatively steady populations have density-dependent growth parameters； that is， rates of birth， death， and migration which depend strongly on population考研英语阅读理解模拟试题及解析(五)
