Follow a burrowing earthworm seeking soil's moisture to protect its oxygen-collecting skin
Cross-section view of an earthworm (Lumbricus) burrowing beneath the soil's...
Encyclopædia Britannica, Inc.
Transcript
NARRATOR: Earthworms take in oxygen through their skin, which must always remain moist. To maintain their skin moisture, earthworms live in burrows beneath the surface of the soil.
Endangered by too much light, they remain in their burrows during the day, emerging only at night or during periods of heavy rain.
Endangered by too much light, they remain in their burrows during the day, emerging only at night or during periods of heavy rain.