Because it’s time consuming and money consuming to observe from space so models are required
        
             
        
        
        
I think at Approximately 7 years the child should be able to use each hand independently. Hand control is the ability by a child to accurately use and manipulate objects, utensils, tools and even finger in isolation for functional tsak performance. 
        
             
        
        
        
Answer:
Depending the hydrolysis .
Explanation:
Okay its negative but at what percent ?