Answer:
A- soil bacteria converts usable nitrogen into nitrogen gas 
 
        
                    
             
        
        
        
Answer:
Explanation:
For question 2 I  think the answer is Endocytosis. 'Exo' means out and 'Endo' means in. 
For question 4 I think it's A. 
If you have ever played it, think of Agario. The bigger the molicule (or circle), the slower it moves. 
I don't know about the others. 
Hope this helps :)
 
        
             
        
        
        
A negative tropism is when a plant grows away from stimulus
        
             
        
        
        
Red-Billed Hornbill Predator-Prey Relationships Lion-Mouse Meerkat-Insect Hyena-Lion<span>Circle</span>