Fact 1: Plants use cellulose for their cell walls.

Fact 2: Most plant fibers are comprised of cellulose.

Given the two facts above, answer the question "What are fibers composed of?" with the following options: 
- lmestone
 - cellulose
 - ribosomes
 - animal fur
 - plastic
 - produce light
 - cellulite
 - Hemoglobin


 

  cellulose       