The answer to this question is :
D. Obstacle Evaluation
        
                    
             
        
        
        
There are so many examples for that in different areas, like TPT1 experiment carried out in our lab recently.Here's one link: http://www.alfa-chemistry.com/tpt1-cas-167218-46-4-item-290583.htm
 
        
             
        
        
        
Answer:
A
Explanation:
The structure of ATP is such that there are three (3) phosphate moelcules in sequence attached to the 5’ carbon of the ribose sugar ring. The O- groups of each phosphate are close to each other and are negatively charged. They, therefore, repel each ohtehr electrostatically and make ATP very unstable – hence considered weak bonds. ADP is more stable than ATP.  Nonetheless, phosphoanhydride bonds between the phosphate have high energy of ΔG of -30.5 kJ/mol. These characteristic make ATP ideal as ane energy currency since it is easy to hydrolyze while producing much energy. 
 
        
             
        
        
        
Answer:
1.a, 2.b, 3. c, 4. c, 5. c
Explanation:
1. 
4H+O2→2H2O 
2.
They must have two or more reactants.
3.
The reaction has more than one product.
4.
S + O2→SO2
5.
2Mg+O2→2MgO