The earthworm extends the front part of the body, keeping the rear end fixed to the ground.

The foot of the snail produces a slimy substance called mucous

Snail has a solid skeleton

Snail has a liquid skeleton

Animals that do not have backbone are called vertebrates

Animals that do not backbone are called Invertebrates.

Animals that have a backbone are called vertebrates

Snails have a pair of wings.

Cockroach body is covered with a hard outer skeleton.

Cockroach cannot fly short distance.

Cockroach have two pair of wings and they can fly short distance.

Cockroach have two pair of legs.

Cockroach have three pair of legs.

Fish are Invertebrates.

Fish have fins and a fixed non flexible backbone.

Fishes have swim bladder that can be filled with air or emptied to help them move up and down.

Birds have solid bones.

birds have hollow bones that make them lightweight.

Snakes do not have backbones.

Most snakes move in a wave like manner.

All the bones in the skull are movable.

Bones are filled with substance called Harrow that produces the blood cells.

Bones are filled with substance callled Marrow that produces the blood cells.

The human skeleton is made up of 206 bones.

Human beings have 12 pair of ribs.

The backbone is made up of 34 small bones called vertebrae.

The backbone is made up of 33 small bones called vertebrae.

The bones are held together at the joints by ligaments.

Joints at the knee and elbow are gliding joint

Cartilage makes the end of the bones rough.

The end of the bones are covered with tough, non elastic tissue called Cartilage.

Movable joints are three types.