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生物群落演替的主要原因可归纳为外因演替和__________ 两种类型。

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人工调控机制名词解释

A flexible work life such as telecommuting, is good for your health, researchers said. They found that if people have the ability to work from home and to compress work weeks, they are more likely to make healthier lifestyle. choices, to exercise more and to sleep better.
While the primary driver behind the flexibility movement was to help people, especially women, combine work and family, evidence suggests this is clearly not only a women's issue, Grzywacz, who reported the findings in the Journal of Occupational and Environmental Medicine, said.
The researchers looked at Health Risk Appraisals from employees in jobs ranging from warehouse and production workers to executives at a large multinational pharmaceutical company.
The firm used for the study is consistently recognized by Working Mother magazine as among the most family-friendly employers in the United States.
He said the research shows public health departments and organizations that they could get something out of giving their employees more flexibility.

种群与生物群落名词解释

农村劳动力转移对于经济社会发展具有哪些积极的推动效应？