Answer:
d
Explanation:
the DNA is smaller than the chromosome by just a bit and 300 miles of DNA fit into a nucleus.
 
        
                    
             
        
        
        
Answer:
<h2>Additionally, environmental pollution is triggered by the introduction of harmful materials, such as gaseous pollutants, toxic metals, and particulate matter (PM) into the atmosphere; sewage, industrial effluents, agricultural runoffs, and electronic wastes into water bodies; and activities such as mining, ...</h2>
 
        
             
        
        
        
It allows scientists to explore new explanations for observations.