Name the organ of movement in the following picture. How does this organ help it to move?

The organ of movement in fish is called fins. They are the special structures present in fish that help them to move through the water. The tail fin helps them to swim and change the direction, whereas other fins help to maintain the balance of the body. These have scales on its body to protect from external injuries. The front part of the fish curves to one side and the tail part swings to the opposite side to form a curve. Then, the body and the tail curve to the other side quickly. This forces the water backwards and pushes the fish forward.

Name the organ of movement in the following picture: How does this organ help it to move?

The organ of movement in earthworm is bristles. An earthworm moves by stretching and contracting muscles by the action of two groups of muscles and hair-like structures. These help the earthworms to get a good grip through the ground. During movement, an earthworm extends the front part of the body, keeping its rear end fixed to the ground with the help of bristles. Then, the bristles under the front part fix the front end and the rear end moves with the help of muscles. Their body secretes a slimy substance that helps for their movement.