You are presented with the question "what uses cellulose for their cell walls?" and the following answer choices: 
- cactus
 - Oak
 - Conifers
 - Trees
 - h2o
 - flowers
 - insects
 - humans

Now knowing that plants use cellulose for their cell walls and vegetation includes shrubs and cactus plants, choose the best answer.


 

 cactus        