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| 1. | A scientist who studies ecology | | 3. | A relationship between organisms in which only one organism benefits | | 4. | A group of the same type of organism living together in a certain area. | | 6. | The study of the relationship between living things and their environment | | 7. | The living and nonliving parts of a specific environment. | | 9. | The part of the earth and atmosphere where life can exist. |
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| 2. | The living parts of an ecosystem | | 3. | The struggle among living things to get what they need to survive. | | 5. | The relationship in which one organism kills and eats another | | 8. | The relationship between organisms in which both organisms benefit. |
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