The document examines how different concentrations of iron affect the growth and reproduction of C. elegans worms. It was hypothesized that increasing iron concentration would beneficially affect the worms. Worms were placed in test tubes with 0x, normal, 2x, and 3x concentrations of iron with and without peptone. Data was collected daily for 3 days counting dead and alive worms. Results showed many worm deaths across conditions, but worms with peptone survived slightly more. The conclusion is that iron concentration did not significantly affect worm fitness.