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: 3. Surroundings; all of the things which surround and influence the development of an organism. 4. A rock made of the shells or skeletons of sea animals. 7. To keep from injury or danger. 8. The way something behaves or acts. 10. A form, model or behavior that is repeated. 11. A cave formation which is a fragile, honeycomb-shaped structure of calcite crystal that sticks out from walls and ceilings of a cave. 12. Having one or few parts; easy to do or understand. 15. A trait or behavior that allows a plant or animal to live successfully in its environment. 16. Something brought about by a cause; or a result. 17. The coloring, characteristics or traits a plant or animal uses to disguise itself or to hide from an enemy.

Down: 1. A series of connecting strands, for example: a spider web. 2. A group of plants and animals in a given area or region that depend on each other. 5. A plant or animals that is no longer found, for example: dinosaurs. 6. An animal that catches and kills another animal for food. 9. The place where a plant or animal lives. 13. A large treeless area of rolling hills covered with grasses. 14. An animal that is caught by a predator.