Answer:
genes containing dna. 
Explanation:
during reproduction genes containing dna, are passed along to an organisms offspring. these genes ensure that the offspring will belong to the same species. 
 
        
             
        
        
        
Many molecules are moved through the body by carbohydrates lipids nucleic acids proteins
        
             
        
        
        
Answer:
Rocks from retreating glaciers
 
        
             
        
        
        
Answer:
A) central nervous system
B) Peripheral nervous system