<span>A scientist measured an increase in nitrous oxide in the atmosphere. This increase would result in the greenhouse effect. </span>
        
                    
             
        
        
        
3) decrease 
Without the green house effect, earth would be like a solid ball of ice and rock.
Life as we know it wouldn't exist without greenhouse gases. 
The temperature would drop below 0° Fahrenheit!
        
             
        
        
        
I am inclined to say 1. core and mantle... but im not entirely sure...
sorry not much help at all!
        
             
        
        
        
Their purpose is reproduction.
        
             
        
        
        
Answer:
-provides protection for a cell
-provides a fixed environment inside the cell.
-The cell membrane also provides some structural support for a cell.
Explanation: