C. elegans is a free-living nematode. It is small—growing to about 1 mm in length—and lives in the soil (especially in rotting vegetation) where it survives by feeding on microbes such as bacteria.

In this lesson, students pose questions, design, conduct, and analyze a controlled experiment testing different behavioral stimuli of the worm C. elegans.

This lesson works best as a follow-up to Caeno-WHAT?? and may replace Chemotaxis in C. elegans as this lesson allows for open inquiry.