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Across
  1. 3. a group of people or animals who are born and live around the same time
  2. 4. when a person or animal is kept somewhere and is not allowed to leave
  3. 6. put into groups according to different features
  4. 8. to go down in number
  5. 9. the type of place that a species usually lives in, such as a desert, forest or lake
Down
  1. 1. the protection of plants and animals from the damaging effects of human activity
  2. 2. a person who does something without payment, especially helping people or animals
  3. 4. worry
  4. 5. very important
  5. 7. a set of animals or plants in which the members have similar characteristics to each other and can have children with each other