A mutation in a plant that could cause negative outcomes could be the plant has less leaves, or isn't hardy enough, like other plants. It would die. A plant from an area like Chernobyl, that has been affected by radiation could poison other animals, or pass that gene along, and ultimately kill that strand of plant.
        
             
        
        
        
They are viruses that infect bacteria and require a bacterial host in order to replicate themselves
        
                    
             
        
        
        
<span>Assuming that this is referring to the same list of options that was posted before with this question, the correct answer is the one that is second from last on the list. </span>
        
                    
             
        
        
        
Answer:
The answer is NITROGENOUS WASTE.
Explanation:
The urinary tract  filters wastes and water from the blood, and eliminates them from the body. 
UREA which is a nitrogenous byproduct of the decomposition of protein metabolism in mammals, is also released into the blood stream and to the tubes, after being broken down by the LIVER. All waste mixes with the filtrate to form urine
Urine is then collected in a duct and excreted through the bladder.