Earthworm fixes its front end and releases the rear end for movement. On a glass, it loses its grip.

The upper part of the human ear is made up of cartilage while the earlobe consists of only muscles.

Body of the snail is covered with a hard shell. This shell does not help the snail in movement. Head of the snail may come out of an opening in the shell. The snail has a thick and strong muscular foot. Foot moves slowly with a wavy motion.

Fixed joint is the one where there is no relative movement of the bones. The joint between the head and the upper jaw is an example of fixed joint.

In ball and socket joint, the round end of one bone fits into the cavity of the other bone, e.g., thigh and hip joint. This type of joint allows movement in all directions.

Bones are rigid and non-flexible whereas cartilage is semi-rigid but flexible. Bones form framework of whole body whereas cartilage forms framework only for a little part of body.

Five types of joints are there in humans:
(a) Fixed joints
(b) Ball and socket joints
(c) Pivotal joints
(d) Hinge joints
(e) Gliding joints

If the body tapers at both the ends, then such shape of the body is said to be streamlined.

The number of bones in each finger is three and are called phalanges.

An earthworm does not have bones or legs. It has muscles which help them to lengthen and shorten the body to move.

No, we can bend our body at every part but only at joints.

The hard and strong skull protects a delicate organ of our body called brain..

Earthworm moves faster than snail.

Earthworm and snail move without the bones.

Heart and lungs are protected by the rib cage.