What are setae made up of?

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Cellulose

Cuticle

Chitin

Lipid

answer is B.

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Detailed Solution

Annelids bear setae which are hair-like structures.
Setae prevent backsliding in Annelids and help them to bind with the surface.
In Annelids setae are made up of chitin. Chitin is the most abundant organic constituent which provides skeletal support and body armor.

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