habitat and adaptation

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Across
  1. 2. a place where animals survive
  2. 5. anything that dirties or harms the environment
  3. 6. builds immunity of a young child
  4. 7. modification in animal to survive
Down
  1. 1. it can reduce waste and have positive effect on environment.
  2. 2. camels to store fat in
  3. 3. obtained from the bark of willow tree
  4. 4. placing living things in groups