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Population Invasion - A Threat to Ecosystem
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1)In ecosystem, the term invasive species refers to: 
  

2)It is too difficult to identify the invasion of Asian long-horned beetle at the early stage. The reason is: 
  

3)Characteristic feature(s) of an invasive species 
  

4)Invasion of Sea lamprey threats the population of 
  

5)An example for a biological control agent to reduce the species invasion in ecosystem 
  

6)The rate of the spread of pest population depend (s) on 
  


  


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