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Across 6. the science that deals with the relation of living things to their environments and to each other 9. no longer existing 11. the green coloring matter in plants 15. something that rots something else 17. a colorless gas that is present in the air needed by plants to produce food 18. a combination of smoke and fog in the air 19. to become rotten, to decay 20. the power to do work 22. a nourishing substance 23. to make something that has not been made before 24. a gas that is in the air 25. being worn away little by little

Down 1. a place where an animal or plant naturally lives or grows. 2. any supply that will meet a need 3. of the sun 4. a gas that is in the air that people and animals need to survive 5. slight wetness 7. to become rotten 8. that which makes the environment dirty or impure 10. a part of the inhabitants of an area 12. the process in a green plant that produces food by using sunlight & chlorophyll 13. to protect from loss or from being used up 14. a person who uses food, clothing, or anything grown by producers 16. all the surrounding things, conditions, and influences that have to do with the growth of things. 21. moisture in the air