Answer:
True.
Explanation:
Fight or Flight response are mainly generated at the time of anger, fear and stress. The sympathetic nervous system of the brain manages the body at the time of natural stress.
The individual to perform well in the high pressure situation is suffering from the natural stress. The response of the body is to release extra hormones to manage this situation.
Thus, the answer is option (a).
 
        
             
        
        
        
Answer: I think you meant scientists and scientists often gather new knowledge by studying the experiments of others
Explanation:
 
        
                    
             
        
        
        
Your answer should be increasing in number
        
                    
             
        
        
        
Answer:
Plant is a producer in food chain
 
        
                    
             
        
        
        
Answer: Option D) China
Explanation:
From the picture provided, China and USA contributes above 5.000.000 ( In thousands of metric tons) of carbon dioxide emissions. 
And since carbon dioxide has been implicated in the emergence of global climate change, both countries are leaders in the emission.
Thus, China is the right option