They breathe through their skin. Air dissolves on the mucus of their skin, so they MUST stay moist to breathe. 
If worms dry out, they suffocate. As fresh air is taken in through the skin, oxygen is drawn into the worm's circulatory system, and the worm's hearts pump the oxygenated blood to the head area.
 
        
             
        
        
        
Answer:
They all contain a transparent part with at least one curved surface that reflects light.
Explanation:
 
        
             
        
        
        
All would be affected because decomposers like to break down dead things meaning dead plants AND animals