+ not having enough food for everyone
+ how many people migrate
+ birth/death rates
+ how much water there is
+ how much nutrients/minerals are available 
+ how much trees/oxygen is available
        
             
        
        
        
Agriscience is the right answer :)
        
                    
             
        
        
        
Beacuse they died long time ago
        
                    
             
        
        
        
Answer: 
 A purulent wound produces fluid which are releases from the purulent wound. Basically, it is the type of the fluid which are produced in the form of milky type and it is the symptoms of the infection in the body. It is also known as purulent drainage, which are basically the sign of infection in the wound or hole in the skin of our body and then it needs proper treatment.