<span>A large complement of decomposers rapidly turns dead plant and animal matter into nutrients that are quickly taken up by plants.
Also, some animals live on eating plants, other animals eat those that live on plants, and animals that live on eating other animals die to make nutrients that are eaten by plants; this also, is called an ecological food chain.</span>
        
             
        
        
        
I think c (it makes getting water easier and and quicker for the cactus 
 
        
                    
             
        
        
        
The best answer would be option 3:
Fault Q occurred before layer K was deposited.
If you'd like to know why:
As you can see in the diagram, fault Q does not cross layer K. It stops right under it, so this means that the fault occurred first, then over a span of time, layer K was deposited.
To rule out the rest:
The oldest layer is the one at the bottom so that should be Layer B.
The youngest should be the top-most layer, unless a fault or an intrusion cuts through it, so Layer K is the youngest. 
The last option is wrong because fault Q cuts through all those layers, which means it happened after those layers were formed.  
 
        
                    
             
        
        
        
White blood cells are what it is called