Pest Control Crossword!

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Across
  1. 3. Something that can not be broken down by micro-organisms is..
  2. 5. An animal that has been introduced as pest control but has become a serious pest itself
  3. 6. Something that can be broken down into non-toxic substances by micro-organisms is..
  4. 7. A toxic chemical used to kill weeds
  5. 9. An interaction between organisms or species, in which the fitness of one is lowered by the presence of another
  6. 11. The rate at which something is produced
Down
  1. 1. An animal that naturally preys on others
  2. 2. The build up of toxic chemicals
  3. 4. Controlling pests by introducing predators
  4. 8. An organism that competes with humans for food/space
  5. 10. A substance used for destroying insects/organisms harmful to cultivated plants