D an ecological footprint
        
                    
             
        
        
        
The correct answer is microbiology.  
<span>
Microbiology is the branch of science that study microorganism. It contains a few sub-disciplines including virology (study viruses), parasitology (study parasites), mycology (study fungi) and bacteriology (study bacteria). Studied microorganism might be unicellular (one cell), multicellular (cell colony), or acellular (without cells).</span>
        
             
        
        
        
Hello,
the answer is fibrous roots
        
                    
             
        
        
        
Answer:
I think it's number 2 (viewpoint).....