which features of the earthworm enable it to move on the ground?

Earthworms can crawl forwards or backwards, but they most often move forwards. An earthworm’s head can be distinguished from its tail by observing the direction the worm moves.

Earthworms have long, thin bodies made up of segments with one collar or band called a clitellum. The clitellum secrets the mucus which forms the cocoon needed to hold the worm’s embryos. If an earthworm is cut in half, the back half dies, but the front half can survive if it contains the clitellum and at least 10 segments behind the clitellum. The front half of the worm regenerates and adds new segments to its body.

Dear student
Some features are :-

• Circumferential and longitudinal muscles on the periphery of each segment enable the worm to move. 
• Earthworms travel underground by the means of waves of muscular contractions which alternately shorten and lengthen the body.
• The shortened part is anchored to the surrounding soil by tiny claw-like bristles set along its segmented length. In all the body segments except the first, last and clitellum, there is a ring of S-shaped setae embedded in the epidermal pit of each segment. .
• The whole burrowing process is aided by the secretion of lubricating mucus. 

​Hope it helps

Earthworms can crawl forwards or backwards, but they most often move forwards. An earthworm’s head can be distinguished from its tail by observing the direction the worm moves.

Earthworms have long, thin bodies made up of segments with one collar or band called a clitellum. The clitellum secrets the mucus which forms the cocoon needed to hold the worm’s embryos. If an earthworm is cut in half, the back half dies, but the front half can survive if it contains the clitellum and at least 10 segments behind the clitellum. The front half of the worm regenerates and adds new segments to its body. The new segments are typically lighter in color and slightly smaller in diameter than the original segments.

Earthworms do not have eyes, but they do have organs that are sensitive to light and touch. These organs help them find their way by sensing light intensity and feeling vibrations in the soil.

TO MOVE, THE EARTHWORM  FIRST  EXTENDS THE FRONT PART OF ITS BODY, KEEPING THE REAR PART FIXED TO THE GROUND . NEXT, IT FIXES THE FRONT PART AND SHORTENS IT, THUS PULLING THE REAR END FORWARD . IT CARRIES OUT SUCH EXPANSION AND CONTRACTION OF MUSCLES REPEATEDLY TO MOVE FORWARD . MUSCLES IN A WORM'S BODY CAN DE SQUEEZED DIFFERENTLY TO CHANGE THE BODY SHAPE . THESE CHANGES IN THE SHAPE HELP THE WORM TO MOVE ALONG.