Polar Bears - Upper Elem

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Across
  1. 3. an animal that preys upon other animal for food
  2. 5. develop gradually, especially from a simple to a more complex form.
  3. 6. A state of prolonged sleep or inactivity that some animals enter during winter to conserve energy.
  4. 7. Natural home or environment of an animal, plant, or other organisms.
  5. 9. The protection and preservation of natural resources and the environment.
Down
  1. 1. of, found in, or produced by the sea
  2. 2. surroundings in which a thing lives
  3. 3. The introduction of harmful substances or products into the environment, often caused by human activities.
  4. 4. A thick layer of fat found under the skin of some marine mammals, used for insulation and energy storage.
  5. 8. change to a new environments.