It a rock form from extrusive rock such as the follow of lava
        
             
        
        
        
Answer:
HYDRA
Explanation:
The nerve cells are scattered in each layer of the body wall and these neurons send information from sensory organs. Based on the given choices above, the organism that has a nerve net that allows it to respond to a stimulus in a coordinated way is the HYDRA.
 
        
                    
             
        
        
        
Sulfuric Acid is a diprotic acid and as such a binary acid.  This is because it possesses two hydrogen as denoted by its formula H₂SO₄
Hydrochloric Acid  -  HCl
Phosphoric Acid -  H₃PO₄
Nitrous Acid  -  HNO₃
        
                    
             
        
        
        
The answer A. DNA in the nucleus controls all cell activity.