Answer:
A. DNA creating mRNA which is used to make a polypeptide
Explanation:
Protein synthesis process involves the DNA creating mRNA, which is used to make a polypeptide. 
 
        
             
        
        
        
Provides the crop with protection from insects and parasites
        
             
        
        
        
A, plant growth would decrease. Decomposers break down organic materials into nutrients and return these nutrients to the soil. The nutrients are vital to plant growth. If decomposers went extinct, then eventually plants would use up all the existing nutrients and start to die.