Answer:
The lymphatic system is a combination of circurlatory and immune systems 
Explanation:
yw :))
 
        
             
        
        
        
Your answer is B I believe good luck!
If it’s not B it’s D
        
             
        
        
        
Decomposers, like fungus.
        
                    
             
        
        
        
Answer:
c. Hydrogen 
Explanation:
Do I really need to explain...
 
        
             
        
        
        
Environments are always changing so organisms need to adapt to survive. The organisms that survive are the ones that are fit to live in that environment, which is where survival of the fittest comes into play.