A very acidic level is 0 on the pH level. and a very basic pH level is 14. 7 on the pH scale is neutral. Anything lower than 7 is acidic, and anything higher than 7 is basic. 
        
             
        
        
        
The answer is : crossing over can increase genetic variations during meiosis
        
             
        
        
        
Answer: Nervous system 
Explanation:
The cerebellum of the brain is the structure of the nervous system known to control various muscles of the body that are involved in involuntary activities such as breathing.
Thus, the nervous system controls and regulates a person's breathing
 
        
             
        
        
        
D. Proteins are composed of amino acids and determines all the structures and functions of the organism.
        
                    
             
        
        
        
Answer:
The relationship between frogs and fishes in a pod is predation.