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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 Check 

Across: 1. Surroundings; all of the things which surround and influence the development of an organism. 4. The act of making dirty; to pollute. 5. A set of happenings; regularly occurring events; an imaginary circle connecting natural happenings, for example: seasons, water, life. 8. A rock made of the shells and skeletons of sea animals. 9. An animal that is caught by a predator. 10. The place where a plant or animal lives. 11. A group of plants and animals in a given place or area that depend on each other. 12. Nearly the same; almost alike. 13. An animal that catches and kills another animal for food. 14. To change or adjust to new surroundings or conditions. 15. A thick growth of trees and shrubs covering a large area. 16. A series of connecting strands, for example: a spider web.

Down: 1. A plant or animal that is no longer found, for example: dinosaurs. 2. A place where something sleeps. 3. Not alike, not the same. 6. A hollow space inside the earth large enough for a person to enter. 7. The way something behaves or acts. 9. To keep from injury or danger. 13. A large treeless area covered with grasses.