I'm pretty sure it's Keratin :l
Saliva and skin
keratin
skin
Keratin.
Tendons, ligaments and cartilege in between.
periosteum : tough fibrous connective tissue membrane that covers the outside of the diaphysis. this protects the bone and serves as a point of attachment.
A tough waterproof skin.
yes it has tough skin
yes
nylon is a tough light waterproof material.. =/
Keratin
keratin
Glass is strong, tough, malleable, transparent and waterproof. One of the advantages of glass is that it conserves heat and protects against outside barriers. In addition because glass is transparent, this allows for consumers to view the quality of goods.
Keratin
Nails are made of up the protein called keratin, which is a tough and insoluble structual protein. It is basically dead skin cells.
their tough scaily skin protects them
I got my Olympus tough at big w for around $250
The skin protects the body by warding off organisms and substances that cannot penatrate it's outer layers. Keratin, the protein that forms the main component of the dead, surface face cells makes the skin waterproof ans tough.