This Does not look like a qustion may you please take it down
        
             
        
        
        
Https://quizlet.com/58016588/biology-chapter-7-assessment-flash-cards/
        
             
        
        
        
A "mutagen" is any physical or chemical agent that interacts with DNA to cause a mutation.
        
                    
             
        
        
        
<span><span>combine to form traits
Chromosomes
</span>Genes are responsible for inherited traits. They are units of coded DNA which are located in a specific place on a chromosome. Genes are the basic unit of heredity, both physical and functional. Genes vary in size in humans, it comes in a few hundred DNA bases to 2 million more. It has been estimated by the Human Genome Project that humans have 20, 000 and 25, 000 genes in between.<span> 
</span></span>
        
                    
             
        
        
        
Answer:
 A.  
Explanation: Maria did not measure the solutions' densities before mixing the solutions.