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: 4. A plant or animal that occurs in a region naturally. 5. A meat eater; an animal that eats only meat. 7. A rock formed of sea sediment consiting mainly of the shells of microscopic marine or aquatic animals. 8. The study of the interrelationships between living things and the relationships between organisms and their physical environment. 10. Surrounds; all of the conditions surrounding and affecting the development of an organism. 12. A living community of plants and animals and the physical environment (oxygen, water, sunlight, soil) around them. 13. The level or depth in the ground where the rock is completely filled with water and there are no air spaces. 14. An animal that seizes and kills another animal for food. 15. An especially suitable place to live. 16. The number of animals or plants that can live and be healthy in a certain amount of space or land. 17. A safe place for plants and animals to live. 19. Water droplets or ice particles condensed from clouds that fall to the earth's surface in the form or rain or snow. 20. A speleothem or cave decoration which is a fragile, honeycomb-shaped structure of calcite attached to the walls and ceilings of caves. 21. A decoration in a cave, for example: boxwork, stalctites or stalagmites. 23. A set or arrangement of things so related as to form a whole. 25. A structure or behavior that enables a plant or animal to live successfully in it environment. 26. Sour or sharp to the taste; a compound that reacts with a substance by eating it away. 28. To protect from harm or danger; a place where animals and plants are kept for protection. 31. An ordorless, colorless gas formed by living or decaying plants and animals; the bubbles in soft drinks (two words). 32. An animal that eats both plants and animals. 33. Calcium carbonate, the predominate mineral in limestone, found in the cave in a variety of crystalline forms. 34. To shield from injury or danger. 35. A force that exerts or applies pressure.

Down: 1. Agent, one that actively contributes to an accomplishment, result or process. 2. To cause, to come into being; anything brought about by a cause. 3. Air or atmospheric pressure. 6. An animal that is seized by a predator. 9. Point beyond which something cannot precede; furthest confines, bounds; restriction. 11. Mutual dependence, animals or plants that depend upon each other for survival. 18. Foreign, introduced into an area where it does not naturally occur. 22. A plant-eater; an animal that only eats plants. 24. To remain alive or in existence. 27. The place where a plant or animal lives. 29. No longer in existence. 30. The solid form of a substance in which the atoms or molecules are arranged in a definite pattern.