Investigate how muscles in the body wall and small bristles enable earthworms to move through soil
Locomotion of the earthworm (Lumbricus)
Encyclopædia Britannica, Inc.
-
Encyclopædia Britannica, Inc.It's a common misconception that no sharks ever sleep.Media Editor: Miranda Chabot
-
Encyclopædia Britannica, Inc.Understanding energy flow in ecosystems.
-
Adapted from C.R. Scotese, The University of Texas at ArlingtonWatch a time-lapse of Earth changing through geologic time, from the Cambrian Era to the projected period of Pangea Proxima.Media Editor: Miranda Chabot
-
Encyclopædia Britannica, Inc.Learn about the difference between prokaryotes and eukaryotes.
-
© Open University (A Britannica Publishing Partner)Learn how game theory applies to the evolution of the peacock's tail.
-
Contunico © ZDF Studios GmbH, MainzA dominant female meerkat expelling a subordinate from the pack.
-
Encyclopædia Britannica, Inc.Learn what defines an organism and consider two candidates for the title of world's smallest organism—the bacteria Carsonella ruddii and Mycoplasma genitalium.
Transcript
NARRATOR: The earthworm's characteristic crawling movement is caused by the action of muscles in the body wall. These lengthen and shorten the body in wavelike motions. Four pairs of tiny hard bristles on each segment help the worm grip the ground and hold onto the side of the burrow.