Answer:
Agriculture allowed people to stay in one place, and increased food production caused the population density to expand far beyond levels that could be sustained by hunting and gathering alone. This growth in population density provided a critical mass of people to sustain and spread contagious infectious diseases.
 
        
                    
             
        
        
        
Answer:
Greywater is gently used water from your bathroom sinks, showers, tubs, and washing machines. It is not water that has come into contact with feces, either from the toilet or from washing diapers Greywater can also be used to irrigate vegetable plants as long as it doesn't touch edible parts of the plants.
Explanation:
 
        
                    
             
        
        
        
The answer is true
i think
        
             
        
        
        
1. Moist adiabatic lapse rate.
2. Normal lapse rate.
3. Dry adiabatic lapse rate.
4. Adiabatic lapse rate.
        
             
        
        
        
C. ice melting...
hope this helps!!