Answer:
a control
Explanation:
you need something to compare it to to see if anything happens
 
        
             
        
        
        
Answer:
Purposes that work to maintain homeostasis include the regulation of temperature, maintaining healthy blood pressure, maintaining calcium levels, regulating water levels, defending against viruses and bacteria.
Explanation:
 
        
             
        
        
        
Deforestation 
Factories that release carbon dioxide and other greenhouse gasses 
Peat bog destruction 
Burning fossil fuels
Power plants usagr
        
             
        
        
        
I am sorry I can only answer 7 for you.
Hope it helps 
7= By replacing the neurons lost from a injury with new cells.
 
        
             
        
        
        
I believe the answer is (B) Parasitic.