Answer:
the same thing that happens to United states will happen to other regions
Explanation:
 
        
             
        
        
        
C. A new substance is produced. All others are physical changes.
        
                    
             
        
        
        
5-Ethyl-3,3,4-trimethylheptane has 3 secondary carbon. A primary carbon written as 1° is a carbon that has one carbon atom attached to it. A secondary carbon written as 2° is a carbon attached to two other carbons, while a tertiary carbon written as 3° is a carbon attached to three other carbons. 
        
                    
             
        
        
        
There are many properties to substances.
I'll list some examples below:
- Mass
 - Volume
 - Density
 - Conductivity
 - Malleability
 - Boiling point
 - Melting point
 - Heat capacity
 
Hope this helps! :3
 
        
             
        
        
        
No, work is not done whenever you hold a heavy object for a long time
<h3>What is work done ?</h3>
The result of a force's displacement and its component of force exerted by the object in the direction of displacement is what is known as the force's work. When we push a block with some force, the body moves quickly and work is completed.
- No work, as that term is used here, is done until the object is moved in some way and a component of the force travels along the path that the object is moved. Because there is no displacement when holding a heavy object still, energy is not transferred to it.
 
Learn more about Work done here:
brainly.com/question/25573309
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