The clitellum is a part of the earthworm's reproductive system. It is the part of the worm that makes the egg cocoon.
The covering of a silkworm cocoon is called a silk filament or silk thread. It is made up of a protein called fibroin, which is secreted by the silkworm to form the cocoon.
externally
mucous which is secreted from mucous membrane
How the heck should I know thats why I looked it Up!
ANSWERAnimals digest their food. The proteins carbohydrates and fat in food. are broken down into simple molecules.
The clitellum of an earthworm is a series of segments that are swollen on the anterior side of the worm.
Cocoon
Prevents the worm form dessication (drying out).
A clitellum is a glandular swelling near the head of earthworms that secretes mucous during reproduction. It is involved in the formation of the cocoon that contains fertilized eggs.
The clitellum is a raised area located near the front of the body on a segmented earthworm. It is a glandular, thickened section of the body wall that secretes a cocoon for egg deposition during reproduction.
After the caterpillar spun its cocoon, it transformed into a butterfly.