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5.3 main threats to terrestrial ecosystems and species (human induced…

- - - - 62% of cancer drugs (weed) (bioprospectors)
      - 0.5% of plants have been examined for med properties
- - - - pest control.pollination
      - most crops/livestock introd by humans
      - decorative plants/trees
    - - travelling seeds
      - traveling diseases
      - escaped pets
    - - natural predators
      - competitors
      - parasites
      - pathogens
    - - biological
        
        using natural enemies
      - mechanical
        
        mowing
        
        hoeing
        
        cultivation
        
        hand pulling
      - chemical
        
        insecticides
  - - - bioaccumulation
        
        DDT (does not break down in enviro)
  - - - medicinal
      - decoration
      - exotic pets
      - bushmeat
      - persecution (seen as threats)