Natural selection is a gradual process where biological traits become more or less common in a population depending on the usefulness of the trait. 
C. Over time, species evolve by adapting to their environment. 
Insecticide resistance developed through d. natural selection. 
        
             
        
        
        
Answer: Option (c) is the correct answer.
Explanation:
A long hydrocarbon chain that consists a terminal carboxylic group is known as a fatty acid.
An unsaturated fatty acid consists a double bond within the fatty acid chain. If a fatty acid contains more than one double bond then it is known as polyunsaturated fatty acid.
For example, oelic acid has chemical formula  is an unsaturated fatty acid.
 is an unsaturated fatty acid.
Therefore, we can conclude that option (c) represents an unsaturated fatty acid.
 
        
             
        
        
        
I believe that the best answer to this question is d. amino acids. 
        
                    
             
        
        
        
Answer:
Sheep carrying out respiration
Explanation:
Because the sheep is exhaling carbon dioxide into the air
 
        
                    
             
        
        
        
 
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