Answer:
notochord, a dorsal hollow nerve cord and pharyngeal slits. 
 
        
             
        
        
        
B.produce antibodies when triggered by antigens
        
                    
             
        
        
        
Polar because it always is below 32 degrees and has no rainfall
        
                    
             
        
        
        
Answer:
59 is false and 60 and true
Explanation: I think it is right sorry if it is wrong. I hope this helps