Answer will help you.
When it involves one sets of cones it is an inherited recessive trait.
        
             
        
        
        
Traits are inherited trough the parents genes that are passed to the offspring trough both parents reproductive cells, that contain genes in their nucleus.
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Happy homework/ study/ exam!
 
        
                    
             
        
        
        
Coal is considered a non renewable source because the earth cannot replenish it.