Brain energy requirement, metabolism and neurotransmitter turnover consume 20 % of the available oxygen and glucose in the body. 
  <span>Even though, the brain is only about 2% of the body weight, it consumes about 20% of the body's energy. It is the main consumer of glucose-derived energy. When the mental strain increases, the brain's demand for energy in the form of oxygen and glucose is higher.</span>
        
                    
             
        
        
        
F is the correct answer I think
        
             
        
        
        
<span>-The nervous system processes information from receptors that detect changes in the environment.
-The nervous system coordinates the systems of the body.
-The nervous system sends out appropriate responses to react to changes in the environment.
-The nervous system maintains homeostasis.</span>
        
                    
             
        
        
        
The kidneys remove dissolved waste in the blood 
Hope this helps!
        
             
        
        
        
answer gradualism Explanation: gradualism refers to the type of evolution that takes a long time