Earthworm behavior lab report. What is your hypothesis for this experiment?

Instead, they can sense light through their skin. These natural light sensors let the earthworms know when they are getting too close to a bright light, such as the sun. Earthworms try to stay out of sunlight because the heat from the sun dries out their skin.

If an earthworm is exposed to dry conditions, then it'll revisit a moist place because its skin must stay moist for the earthworm to survive.