| Term | Definition |
|---|
| adaptation | a physical or behavioral characteristic that helps an organism survive in its environment |
| symbiosis | a close, long-term relationship between two or more species |
| predator | an organism that consumes another. |
| prey | an organism that is eaten by another. |
| mutualism | a relationship where both organisms benefit from the association. |
| commensalism | a relationship where one organism benefits and the other is unaffected. |
| parasitism | a symbiotic relationship where one organism benefits and the other is harmed. |
| parasite | an organism that feeds off of another living creature, usually without killing it |
| host | the organism that is harmed in a parasitic relationship |
| competition | when two or more organisms fight for the same limited resource. |
| commensalism | A bird builds its nest in a tree where it is safe from predators. The tree is unaffected by the birds. |
| Parasitism | A tapeworm lives inside the digestive tract of a dog. The dog begins to lose weight over time because the tapeworm is taking away its nutrients. |
| Mutualism | Stinging ants live in a tree with thorns for protection. In turn, the ants protect the tree from being eaten by other animals. |
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