A) several kinds of polysaccharides
B) layers of proteins and a polysaccharide called chitin
C) several kinds of proteins
D) single complex protein called arthropodin
Correct Answer: A
Solution :
Arthropods are the most successful group of animals, their success is due to unique chitinous cuticle. Exoskeieton is light weight, tough and composed of structural polysaccharide chitin.
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