Muscle tissue is the outer layer that protects your muscles and helps them to move without falling off.
        
             
        
        
        
The explanations of natural phenomena, and additional hypothesis most often come about as a result of a scientific theory.
Explanation:
Scientific theory is a general explanation of natural phenomena developed through extensive and reproducible observations, more general and reliable than a hypothesis.
Then Every scientific theory starts as a hypothesis. A scientific hypothesis is a solution for an unexplained occurrence that does not fit into a currently accepted scientific theory. It must be based on careful rational examination of the facts.
 
        
             
        
        
        
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They build more houses and more factories to produce more goods for the population also including more vehicles for more income of people buying them. Stores and etc.