Answer:
B. An egg cell and a sperm cell unite. 
Explanation: 
 
        
                    
             
        
        
        
D. the <span>stomata close to preserve water and gas exchange decreases.</span>
        
             
        
        
        
<em>the correct option for this is B>></em>
        
             
        
        
        
*Water* 
Explanation: 
Abiotic Factor is non-living.
        
             
        
        
        
Plant cell. it an keep its shape beacuse it has a cell wall. it might have chlorophyll in it which allows photosynthesis