Question

what biological matter forms earthworm setae structure

Answer 1

Hi
The segmented body parts provide important structural functions. Segmentation can help the earthworm move. Each segment or section has muscles and bristles called setae. The bristles or setae help anchor and control the worm when moving through soil.

Answer 2

Setae are bristles like structure present on the body of a earthworm. Setae are small muscles like structures present on the body of a earthworm. Each segment contains setae that helps earthworm to move and cling to surfaces such as soil particles.  

Mainly, the setae are made up of chitin. Chitin is a fibrous substance made up of polysaccharide, and a major constituent of fungi cell wall.