Hello There! ^_^
Your question: What is a darker contour line usually every fifth line..?
Your answer: An indes contour is a contour line that is usually in every fifth line.
Hope this helps!
        
                    
             
        
        
        
An allele whose trait always shows up in the organism is called the answer is dominant allele.
        
                    
             
        
        
        
Energy from the sun heat and chemicals
        
             
        
        
        
A
A is correct for this problem