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