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: 2. A set or arrangement of things so related as to form a whole. 4. All of the conditions surrounding and affecting the development of an organism. 5. The loss of water; change of state from liquid water to water vapor. 7. Foreign, introducted into an area where it does not naturally occur. 8. A compound capable of dissolving limestone. 10. A structure or behavior that enables a plant or animal to live successfully in its environment. 11. The solid form of a substance in which the atoms or molecules are arranged in a definite pattern. 12. An especially suitable place to live. 13. The process of depositing materials through a natural process. 14. A speleothem or cave decoration which is a fragile, honeycomb-shaped structure of calcite attached to the walls and ceilings of the cave. 16. The study of the earth, its rocks and landform. 17. Calcium carbonate, the predominate mineral in limestone, found in caves in a variety of crystalline forms. 20. The number of animals or plants that can live and be healthy in a certain amount of space or land (two words). 21. A safe place for plants and animals to live. 22. A rock formed from sea sediments consisting mainly of the skeletons of marine or aquatic animals. 23. A meat-eater; an animal that only eats animals. 24. To change or adjust to new surrondings or conditions. 25. A living community of plants and animals and the physical environment (air, water, sunlight, soil) around them. 27. An animal that is seized by a predator. 28. Air or atmospheric pressure. 29. A plant-eater; an animal that only eats plants. 30. To merge with a liquid; to disappear into a liquid. 32. No longer in existence. 33. The level or depth in the ground where the rock is completely filled with water and there are no air spaces (two words). 34. To protect from harm or danger, a place where animals and plants are kept for protection.

Down: 1. Mutual dependence, animals or plants that depend upon each other for survival. 3. A force that exerts or applies pressure. 6. A plant or animal that occurs in a region naturally. 9. The study of the interrelationships between living things and the relationships between organisms and their physical environment. 15. An animal that eats both plants and animals. 17. An odorless, colorless gas formed by living or decaying plants and animals; the bubbles in soft drinks (two words). 18. To cause, to come into being; anything brought about by a cause. 19. A decoration in a cave, for example: boxwork, stalactites or stalagmites. 26. An animal that seizes and kills another animal for food. 27. A large treeless area covered with grasses. 31. A series of connecting strands; the network spun by a spider.