The introduction of non-native exotic species is now seen as a major threat to biodiversity. In 1825, a particularly vigorous female clone of itadori (called Japanese knotweed) was introduced into Holland and later distributed throughout Europe by the plant collector and nurseryman, Von Seybold. British gardeners loved it and by 1886 it was even found growing on cinder tips in South Wales. By the turn of the century, the plant had colonized many other sites, and gardeners were advised against planting it in shrubberies. By 1994, it was almost everywhere — railways, riversides, hedgerows, cemeteries — swamping a wide range of habitats and displacing rare species. Botanists' fears that the plant is still spreading and may yet colonize other new habitats have generated recent attempts to eradicate it by mechanical and chemical methods, all in vain as yet.
下列屬于商業銀行現金資產的有()。

下列屬于商業銀行現金資產的有()。

管理學題庫發布時間41 |

西藏正式成為我國古代中央政府的一個行政區域是在()。2008年6月以來,聯合國安理會多次通過決議,授權有關國家加強合作,進入亞丁灣、索馬里海域打擊海盜。2008年12月,經聯合國授權和應索馬里政府的邀請,中國人民解放軍海軍前往亞丁灣、索馬里海域實施護航任務。這說明()。…

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