Decomposers and scavengers break down dead plants and animals. They also break down the waste (poop) of other organisms. Decomposers are very important for any ecosystem. If they weren't in the ecosystem, the plants would not get essential nutrients, and dead matter and waste would pile up.
        
             
        
        
        
Answer:
B. Gravel has more porosity than sand
Explanation:
Porosity is the gap between stuff. Water would go through gravel easier than sand.  Definition of Porosity is -(of a rock or other material) having minute spaces or holes through which liquid or air may pass.
 
        
             
        
        
        
Answer:
A food web consists of all the food chains in a single ecosystem. 
Explanation:
Hope this helps, Mark me brainlist, Please. 
 
        
                    
             
        
        
        
D.
It produced reproductive cells.
Trust