It is important because we need to learn the environment, what is around us.
        
             
        
        
        
Homologous
 
The fins of fishes and flipper of a whale are homologous structures since they have different structure but similar structure
 
        
                    
             
        
        
        
Electrical products
Explanation - Polymers of electrical products can be produced in large quantities and low cost. This type of polymer are non-conductive in nature. However, they very high heat resistance property. Polymers for electrical products can mold itself in various shapes and sizes and also can reach very minute areas. 
Polymers vary from one item to another. Polymers for commercial packaging is different from polymers of electrical products. Thus, polymers need to be chosen properly according to the use and its effectiveness.  
 
        
             
        
        
        
Answer: Salt, Soda, Fire Extinguishers
Explanation:
 
        
             
        
        
        
Answer:
the variable that is being measured