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Across 3. Holds the air in 7. are characterized as having grasses as the dominant vegetation. Trees and large shrubs are absent. 8. environmental conditions that limit the growth, abundance, or distribution of an organism or a population of organisms in an ecosystem 9. ground 12. The amount of items a place can hold, example, the i wireless center holds 1000 people 15. living organism 16. when things partake in something together they are having __ 17. the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch. 18. group of living things working together 19. the activity or condition of competing.

Down 1. is the increasing concentration of a substance, such as a toxic chemical, in the tissues of organisms at successively higher levels in a food chain 2. When they die because they can't eat they die of ____ 4. comes from the sun 5. interaction between two different organisms living in close physical association, typically to the advantage of both. 6. in the ocean and has hydrogen and oxygen molecules 9. a number of people or things sharing a specified characteristic and following one after the other. 10. the part of the water cycle where water falls 11. When big man eats small boy or lion eats pig 13. non living organism 14. a large naturally occurring community of flora and fauna occupying a major habitat, e.g., forest or tundra.