Feathers
The white outer coating on teeth is called enamel.
The white outer coating on teeth is called enamel.
The flux is the outer coating on a welding rod. The flux is a very important part of the welding rod.
Spiders are arachnids, which means that they are animals with exoskeletons. Their "skin" is a hard outer coating that protects their soft inside bodies.
to protect from predators
they have coating of wax on the outer surface of their body
Cell Membrane
OmpF (outer membrane protein)
Trichomes
It is called the cuticle.
Mainly Diatoms
No hard outer coating. Although they do have a jelly coating for minimal protection. Some eggs are also toxic.