True vocal cords is the answer <span>ʕ•ᴥ•ʔ</span>
        
             
        
        
        
Explanation:
The unit of evolution is the population. A population consists of organisms of the same species that live in the same area. In terms of evolution, the population is assumed to be a relatively closed group. This means that most mating takes place within the population.
 
        
             
        
        
        
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