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271803987ff0136f61c1fa15394f8690
2009-10-03 09:54:27

Human activities have meant invasive species have been able to populate parts of the world to which they are not native and alter biodiversity there over thousands of years.


Word of the Day
pawl
  • A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.
The word 'pawl' probably comes from a Latin word meaning 'stake'.
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