The Rhizobium or Bradyrhizobium bacteria colonize the host plant's root system and cause the roots to form nodules to house the bacteria. The bacteria then begin to fix the nitrogen required by the plant.
        
             
        
        
        
Answer:
contractile vacuole
Explanation:
contractile vacuole is used for balance of water,salt etc
 
        
             
        
        
        
This varieation can be justified because since they had different variations they probably had different niches which led them to evolve differently,this will help because the two species will have no competition
        
             
        
        
        
Answer:
i think when you drink it
Explanation:
 
        
                    
             
        
        
        
I don't know if this will help you or not but here you go.
https://quizlet.com/225903868/lesson-11-the-nature-of-life-unit-test-biology-a-unit-1-the-nature-of-life-flash-cards/