This is a cellular respiration question, related to biology.
Some processes in our bodies require the use oxygen, others do not.
In this case, the conversion of pyruvic acid to acetyl co-enzyme A and the production of water in the electron transport chain do require oxygen. 
If oxygen was not present for pyruvate, it would turn into lactic acid via fermentation. Water in the ETC is formed in the process when NADH and FADH2 are converted to molecular oxygen due to the electron transporters. The protons are then pumped and oxygen is reduced to form H2O. 
 
        
                    
             
        
        
        
Answer: B)	Genetic information is passed from parent to offspring, with no genetic variation.
Explanation: Cause I got it right on USA
 TESTPREP, next time can you please put the multiple choice complete!
 
        
             
        
        
        
Answer:
B
Explanation:
Photosynthesis only takes place in the light, while cellular respiration takes place in the light and dark.
https://youtu.be/xmfhKbmQhq0
Photosynthesis vs. Cellular Respiration Comparison
 
        
                    
             
        
        
        
Answer:
Serotonin 
Explanation:
Please mark me brainliest