Producer would be missing vital nutrients
Would be missing ammonia 
Please mark my answer as brainliest 
 
        
             
        
        
        
Answer:
the correct answer is A
Explanation:
definition of a decomposer is an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material.
so A is the answer
If brainiest is earned its greatly Appreciated
 
        
             
        
        
        
Answer: nucleus
Explanation: The nucleus contains the DNA which is a genetic material that contains all the instructions for protein synthesis. Before proteins are produced, the DNA is first of all copied into an single stranded RNA in a process known as transcription. This process takes place in the nucleus. The single stranded RNA then leaves the nucleus to the ribosome where protein synthesis takes place, there the RNA is translated into a polypeptide chain. 
 
        
             
        
        
        
Answer:
a. 
Explanation:
pathogens may enter the body and cause illness.