Answer: A. ionic 
In ionic bonds electron are transferred from one atom to another. In ionic bonds , the metal atom loses electrons to become positively charged cation whereas the nonmetal atom accepts those electrons to become negatively charged anion.
 
        
                    
             
        
        
        
the skin covering the human body consists of 2 layers.
 
        
                    
             
        
        
        
Anxiety, overexcitement, inability to focus, poor coordination, and shaking are common side effects of substance abuse. The class of drugs includes cocaine, nicotine, ecstasy, and amphetamines.However, any drug when used that can cause euphoria or feeling “high”  can become a drug of abuse.
        
                    
             
        
        
        
The supporting structure of the cell that is also involved in movement is most likely the cytoskeleton.
 
        
             
        
        
        
Answer:
1. A massive star depletes its nuclear fuel; gravity overpowers the star; supernova occurs; core of star collapses
2. black hole; gravitational pull
3. The center of the Milky Way
Explanation: