Answer:
Urban explosion would be a concern in regard to environmental science because of two major things. 
Explanation:
There is the amount of space the growing cities will take up that takes away from the environment, and the pollutants the cities produce.
Hope This Helps :)
Melina B.
 
        
             
        
        
        
People starting to eat healthy
        
             
        
        
        
Answer:
Option C. The number of oxygen atoms is the same before and after the reaction.
Explanation: 
When hydrogen combine with oxygen, water is formed. According to law of conservation of matter, matter cannot be created nor destroyed during a chemical reaction. So according to this law, the amount of reactants is equal to the amount of product produced after a chemical reaction and the number of oxygen atoms is the same before and after the reaction.
 
        
                    
             
        
        
        
When two react with two fatty acid molecules a digylceride forms. And when three react with three fatty acid molecules a triglyceride forms. Triglycerides formed <span>between glycerol and unsaturated fatty acids are usually oils. Those </span>formed<span> with saturated acids are usually fats.</span><span />