Answer:
Oxygen.
Explanation:
Aerobic respiration occurs in the presence of oxygen.
 
        
             
        
        
        
Answer:the answers are a and d 
Explanation:
I did the test sorry if wrong
 
        
                    
             
        
        
        
Automatically region nervous system
        
             
        
        
        
Beets, carrots, turnips, onions, radishes, and (the odd one out) celeriac.
        
                    
             
        
        
        
Answer:
It has increased
Explanation:
The concentration of carbon dioxide in the atmosphere has increased in the last 200 years. The extra carbon dioxide is causing an enhanced greenhouse effect greater than would happen naturally.