The best way to prevent cholera is to promote healthy sanitation practices and to filter and treat drinking water sources.  Cholera bacterium is usually found in water or food sources that have been contaminated by feces from infected person with cholera. It is mostly found and spread in places with inadequate water treatment, poor sanitation, and inadequate hygiene.
        
                    
             
        
        
        
Internal means its on the inside 
external means its on the outside 
so an internal regulator is when the proteins respond to events on the inside of a cell 
and an external regulator is when the proteins respond to events outside the cell
        
                    
             
        
        
        
A psychological disorder or a mental disorder is compose of behavioral and psychological symptoms impacting on areas of one's life causing further problems. When a psychiatrist like Dylan works on the causes of the disorder such as chemical imbalances, he is now working on the Biological perspective of the treatment.
        
                    
             
        
        
        
Answer:
This means that one amino acid can be coded by more that one codon.
Explanation:
A triplet code that code for an amino acid during translation is called genetic code. The genetic code is said to be redundant because a single amino acid can be coded by more that one triplet codon.  
So there can be synonymous codon for one amino acid. For example, leucine, serine, and arginine have 6 synonymous codons.
The genetic code is unambiguous also because each triplet codon can only code for a particular single amino acid. Genetic code is also universal which means the same code is used in all life forms.