Answer:
Cellular respiration, the process by which organisms combine oxygen with foodstuff molecules, diverting the chemical energy in these substances into life-sustaining activities and discarding, as waste products, carbon dioxide and water.
 
        
             
        
        
        
Answer:
A.
Explanation:
It shows a clear view of what a group of cells of a plant would be like.
 
        
             
        
        
        
Answer:
naturally living organisms 
 
        
             
        
        
        
Temporary changes would be weather, since it can change at any givin time another example would be tides coming in because they vary by day, or wet sand becoming dry sand!