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| A process by which characteristics that make an individual better suited to its environment become more common in a species. |
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| A behavior or physical characteristic that allows an organism to live successfully in its environment. |
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| The role of an organism in its habitat, or how it makes its living. |
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| The struggle between organisms to survive as they attempt to use the same limited resource. |
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| An interaction in which one organism kills another for food. |
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| The organism that does the killing in a predation interaction. |
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| An organism that is killed and eaten by another organism. |
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| A close relationship between two species that benefits at least one of the species. |
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| A relationship between two species in which both species benefit. |
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Definition
| A relationship between two species in which one species benefits and the other is neither helped nor harmed. |
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| The organism that benefits by livng on or in a host in a parasitism interaction. |
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| A relationship in which one organism lives on or in a host and harms it. |
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Definition
| The organism that a parasite lives in or on in a parasitism interaction. |
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Definition
| The series of predictable changes that occur in a community over time. |
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Definition
| The series of changes that occur in an area where no soil or organisms exist. |
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| The first species to populate an area. |
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Definition
| The series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist. |
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