| "Survival of the Fittest" | |
| Season 7, Episode 17 | |
| [[File:|center|]] | |
| Air date | March 29, 2001 |
| Written by | Joe Sachs |
| Directed by | Marita Grabiak |
| Episode Guide | |
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Survival of the Fittest is the 17th episode of the seventh season of "E.R."