Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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Across: 1. Surroundings; all of the things which surround and influence the development of an organism. 4. A thick growth of trees and underbrush covering a large area. 5. A hollow space inside the earth large enough for a person to enter. 8. The coloring, characteristics, or traits a plant or animal uses to disguise itself or to hide from an enemy. 10. To change or adjust to new surroundings or conditions. 12. A series of connecting strands, for example: a spider web. 13. Not alike, not the same. 14. An animal that catches and kills another animal for food. 15. To keep from injury or danger. 16. A group of plants and animals in a given area or region that depend on each other.

Down: 1. A plant or animal that is no longer found, for example: dinosaurs. 2. Something brought about by a cause; or a result. 3. A place where something sleeps. 6. Nearly the same; almost alike. 7. The place where a plant or animal lives. 9. A rock made of the shells or skeletons of sea animals. 11. An animal that is caught by a predator. 15. A large treeless area covered with grasses.