解析库 > 填空经典1290题
5.Human-caused disturbances, such as habitat destruction and the introduction of nonnative species, are among the leading causes of plant and animal population declines. Most populations are affected by a combination of adverse human pressures, each of which is in itself insufficient to (i)_____ a population crash. Therefore, studies of population declines that (ii)_____ individual factors and thus (iii)_____ potential interactions may lead to improper management of declining species.
- focus on
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