I’m pretty sure it’s oxygen gas
        
                    
             
        
        
        
Answer:
add 2 electrons
Explanation:
 Add 2 electrons to carbide atom make it neutral because there are two unpaired electrons present in the carbide atom and it has -2 charge. So the carbide required two electrons for pairing and make the carbide atom neutral.  for adding two electrons its all unpaired electrons paired to other two electrons which complete its valency and make it a stable atom.
 
        
                    
             
        
        
        
Answer: The answer is A 
Explanation: The acetabulum is a concave area of the pelvis that forms a socket into which the femoral head fits. Together they form the hip joint.
 
        
                    
             
        
        
        
Theory can be changed based on new research but law is backed up with immense info and is has not been broken once
        
                    
             
        
        
        
Some renewable energy sources are Wind, Solar, and water, these are all better to use then like coal or gas to power houses or cars, there safer to use because they dont produce any harmful chemicals like coal or gas do.