Endangered species

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Across
  1. 3. to keep something as it is, especially in order to prevent it from decaying or being damaged or destroyed
  2. 5. no longer existing
  3. 6. a natural event such as flood, earthquake,etc.
Down
  1. 1. a set of animals or plants in which the members have similar characteristics to each other and can be breed with each other
  2. 2. the natural environment in which an animal or plant usually lives
  3. 4. in danger of being harmed,lost unsuccessful