A substance with pH 6 would be an acid, because it's 1pH to the left of a neutral substance
        
             
        
        
        
Answer:
I believe it's d... or b 
Explanation:
So I'm pretty confident that it's D seeing how it substitutes or deletes but it's only ONE gene... 
 
        
                    
             
        
        
        
Answer:
B. interconnected
Explanation:
All the systems in our bodies (humans are indeed animals) are connected with each other to create a functional being. The blood flows throughout the body, providing nutrients; the bones support the structure and protect the heart and lungs. They work together.
Why not A: The systems are all completely necessary. There's nothing extraneous in our bodies, because extraneous stuff takes up energy, and our biology is incredibly economical.
Why not B: They're not interchangeable. How would you like your bones to turn to blood? Uh-huh.
Why not D: They interact with each other consistently, so they're not separate or segregated.
 
        
             
        
        
        
It would be carbon dioxide
        
                    
             
        
        
        
Answer:
A. Order is more specific than class
Explanation:
Family, Genus and Species comes after Order.