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Exoskeleton/ Chitin
Chitin
It is called the exosketon. It is made from a hard protein, chitin, which arthropods often biomineralize for further strength.
the Auricle
Arthropod have exoskeleton. The exoskeleton is composed of a thin, outer protein layer, the epicuticle, and a thick, inner, chitin–protein layer.
When an insect sheds its outer skin, it's called molting.
The outer part
it is called cortex :D
Corona
The outer skin is called the rind. The inner white material is called the pith.
Dermal tissue is the outer covering of a flower. The inner part of a flower is commonly called the stamen. Another part of a flower is called the petal.
No, it is a Mollusc.