The cockroach's shell is made of chitin, a complex polysacharide that is also found in the shells of crabs, and lobsters. Artificial chitin is also achieved by human. th
ey are also stupid. says people who r stupid lyk me!!!!
Hull
The tough outer covering that lies just outside the cell membrane in a plant cell is called the cell wall. In plant cells, it is usually made up of cellulose, hemicellulose and pectin.
Exoskeleton/ Chitin
This is called bark.
aponeurosis
Schlera
The bodies of arthropods are supported by a hardened exoskeleton made of chitin, a substance produced by many non-arthropods as well. In arthropods, the nonliving exoskeleton is like a form-fitting suit of armor.
The tough outer covering of bone is called the periosteum. It is a dense connective tissue that protects the bone and plays a role in bone growth and repair.
It is a shell, as in a cockle shell or oyster shell.
Because insect wings are delicate. Most of the beetles (to which ladybirds belong) have a hard protective cover over their wings, to protect them from damage as the insect moves. This Keratin covering is tough and weatherproof.
The fibrous covering of a bone is called the periosteum.
Earthworms are covered by a thin skin called epidermis. The epidermis is covered with a thin, protective cuticle that must be kept moist to permit the passage of oxygen through it.