Answer:
The troposphere is the lowest layer 
Explanation:
hope this helps!! there could be more that are right I'm just not sure so
 
        
                    
             
        
        
        
Answer:
Antibiotic resistance is a consequence of evolution via natural selection.
Explanation:
The antibiotic action is an environmental pressure; those bacteria which have a mutation allowing them to survive will live on to reproduce. They will then pass this traits to their offspring which will be fully resistant generation
 
        
             
        
        
        
Mutualism  interaction do both species benefit?