Answer:
Explanation: Members of Kingom Plantae are autotrophs, meaning they produce their own food via photosynthesis. They are multicellular organisms. On a cellular level, members of Kingdom Plantae have cell walls ( members of Kingdom Animalia lack cell walls in their cells, but have red blood cells instead) 
 
        
             
        
        
        
Air, water, some kind of food or sustenance <span />
        
             
        
        
        
Answer:
Burning of a candle
Explanation:
All of the other things cannot be undone. the burning of a candle can. Blow the candle out and you have undone a phisical change
I hope this answer helps you :)
 
        
                    
             
        
        
        
It's A, a limiting factor is something that constrains the population size