Chapter 19 Ecosystems

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