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278国家公园 14’13
P1:human societies have long been dependent on the deliberate transport of plants to meet the basic needs of human’s .
P2: global dispersers can be 好的也可能是detrimental(有害的) beneficial:essential to agriculture. Drawbacks: immigrants prosper can cause environmental and economic damage. B’s universally agreed definition of weed, and these species cause economic losses and adverse effects on human health and also cost lots of money.
P3: two conclusions about the origin of the weed: 1.not native but introduced by humans. 2. were introduced deliberately e.g.
P4: in this article: explore motivations, explore biological basis, make some predictions, suggest areas for research, begin exploring the role that natural force play in moving weedy species. |
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