Chapter 19 human influences on ecosystems

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Across
  1. 2. the number of different species that live in an area
  2. 5. an area of ground covered by a single crop
  3. 6. one solution to protect endangered animals is _________ breeding
  4. 7. if larger numbers of livestock are kept in an area than would normally live there, we call this type of farming__________
  5. 9. one solution to protect endangered plants is __________
  6. 10. a type of greenhouse gas
Down
  1. 1. farmers use these to kill weeds
  2. 3. farmers use _________ breeding over many generations to improve production
  3. 4. farmers use these to kill insect pests
  4. 8. a term used to describe a species which risks extintion
  5. 11. a process which results in the reduction of oxygen in water