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. 
 
        
             
        
        
        
<span>a. What is one adaptation of a mangrove tree species that allows it to survive in its environment? 
Answer: </span><span>Two key </span>variations they need are the flexibility<span> to survive in </span>wet<span> and </span>hypoxia<span> (no oxygen) soil, </span>and therefore the<span> ability to tolerate </span>briny<span> waters. Some mangroves </span>take away<span> salt from </span>briny water<span> waters through ultra-filtration in their roots.</span>
        
                    
             
        
        
        
The type of lipid that estrogen is testosterone 
        
                    
             
        
        
        
Answer:
regulates the menstrual cycle
Explanation:
The other 2 answers are apart of the reproductive system
 
        
                    
             
        
        
        
Answer:
D. Library Book
Explanation:
This is because library books can not be recycled. Sorry if my answer is wrong, just trying to help.