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Across 1. Where all life exists 6. Any biotic or abiotic factor that will affect population sizes. 11. Living factors of an ecosystem 12. Water portion of the biosphere 13. Where an organism lives 15. Biotic relationship where one species is benefited but the other is harmed. 16. How high life can exist in the atmosphere. 17. Biotic relationship where one member benefits and the other is not affect. 18. Relationship where one organism huts and kills another primarily for food. 19. Biotic relationship between two species or individuals that both want a limited resource. 24. All the various species (or biotic factors) in an ecosystem. (2wrds) 25. Biotic relationship were both species benefit from the interaction. 27. All the members of the same species within an ecosystem 28. The study of organisms and how the interact with the environment. 29. To convert from milligrams to grams you would ________ the number by 1000.

Down 2. How many centiliters that are in one liter. 3. Organisms that interact with each other in an ecosystem. 4. How many millimeters are equal to 1 centimeter 5. Tolerance zone that is best for a species and population numbers. 7. Land portion of the biosphere 8. Air portion of the biosphere 9. Competition between 2 different species. 10. Level of ecology that is a combination of both the biotic and abiotic fators. 14. Competition between members of the same species. 20. Tolerance zone where the biotic factors are not conducive to support a species. 21. The role a species within the environment. 22. Factors in ecosystems that are not living 23. A set of abiotic factors that a species can survive in 26. A regions in the world that has similar biotic and abiotic factors