Mention the role of all prostomium, citelium and gizzard
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Prostomium is the head portion of the earthworm's body. Since it has no sensory organs , the prostomium works as a sensory organ to help it tunnel through the soil.
The clitellum is a thickened glandular and non segmented section of the body wall near the head of the earthworm that secretes a viscid sac in which the eggs are deposited. The clitellum is part of the reproductive system of earthworm. It also secretes a viscous fluid to form a cocoon for it's eggs.
Gizzard, in many birds, the hind part of the stomach, especially modified for grinding food. ... Located between the saclike crop and the intestine, the gizzard has a thick muscular wall and may contain small stones, or gastroliths, that function in the mechanical breakdown of seeds and other foods.