The carbon footprint can be decreased by a great amount if the incandescent bulbs are replaced with the compact fluorescent bulbs. The compact fluorescent bulbs uses approximately seventy five percent less energy than the incandescent bulbs as they do not use heating mechanism to light. This leads  to less emission of the green house gases and thereby reducing the carbon footprint. 
Hence, the correct answer is 'option a - replacing incandescent bulbs with compact fluorescent bulbs'.
 
        
                    
             
        
        
        
i think that it is a generator
        
             
        
        
        
Answer:
The correct answer is "both Cdc6 and Cdt1"
Explanation:
The replisome is a complex molecular system that allows for the replication of DNA in yeast. There are multiple genes that participate in the replisome function, however if a researcher finds out that a yeast strain fails to properly form replisomes it is very likely that the genes that might be mutated are both Cdc6 and Cdt1. Cdc6 and ORC are the genes that send the signal to the yeast to start the replisome formation, and Cdt1 is a DNA replication factor that if it is mutated it could cause that yeast is not able to form the replisome.
 
        
             
        
        
        
They probably fall into the bacteria catagory