That varies from manufacturer to manufacturer.
Viper's are covered with an outer layer of scales.
Kingfishers are covered in feathers.
Birds are covered with feathers. Bats are covered with hair.
No, a gasoline engine cannot operate in outer space because it requires oxygen to combust the fuel. In the vacuum of space, there is no air for combustion to occur, so the engine would not work.
They have exoskeletons - they are covered with a hard outer covering made of chitin.
A guppy is a tropical fish, and is covered by fish scales.
Not really. They outer body covering is called chitin.
An elephant is covered in rough skin.
They were made of wood with a steel outer 'tire'
the squids body is covered in a thin layer of sperm that helps it get away from its prey
A nucleus because it is a commonly used outed covered structure.
NO. They have a slime covered skin that helps with traveling through the mud