A substance that releases Hydroxyl Ions in water is called a Base
        
                    
             
        
        
        
Answer: 
Explanation:   
Doctors,nurses and other medical stuff must study biology to learn how to aid both humans and animals. Learning about the human bodys inner processes, organs, neurological system, blood, reproduction development and diseases all prove essential for treatment and research. 
 
        
                    
             
        
        
        
Answer:
bc it has cities surrounding it
Explanation:
 
        
                    
             
        
        
        
adaptations.
Natural selection leads to traits called adaptations, which improve an organisms ability to survive and reproduce.