Answer:
CO2 and H2O are the reactants in the given reaction
Explanation:
The reaction that is written in the question is the general equation of photosynthesis.
                     In this reaction the carbon di oxide reacts with water to form glucose ,oxygen and water.The overall reaction is given below 
    6CO2+12H2O= C6H12O6+6O2+6H2O 
carbon di oxide(CO2) and water(H2O) act as reactant in the above reaction.
 
        
             
        
        
        
Answer:
No, they only carry out reproduction. 
Explanation:
individual viruses don't carry translational machinery, namely, the proteins needed to read their DNA and RNA and build new viruses. They invade a cell and hijack its genetic tools to do it for them.
 
        
             
        
        
        
Answer:
Energy can not be created or destoryed but converted.
 
        
             
        
        
        
Answer:
yes A system can be also be a system