this is what u usually learn in these grades for technology
 
        
             
        
        
        
The dichotomous key is used as a classifying tool for items in the natural world, (trees, wildflowers, mammals, reptiles, rocks...). At each step of the classification process,<span> the user is given two choices and each choice leads to another question until the item is identified.</span>
<span>A dichotomous key starts with specific information and leads to general information.
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I think it’s C but I could be wrong
        
             
        
        
        
It is called DNA. 
Hope this helped :)
        
             
        
        
        
Answer:
R r One uppercase R and one lowercase r
Explanation:
<em>Heterozygous </em>means having two different alleles. Since R is the dominant it means she has red hair and is still heterozygous.