Answers

2016-03-24T07:40:12+05:30
It constitutes chitin a hard substance of sugar
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2016-03-24T10:25:48+05:30
Chitin a long chain polymer of N-acetylglucosamine constitutes the exoskeleton of cockroach and hormone bursicon helps in hardening of the exoskeleton replacing the cuticle. 
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