The same meaning would be shy
        
             
        
        
        
An exoskeleton is the outer skeleton of an animal to protect them. An exoskelton is also called a shell.
 
        
             
        
        
        
They begin to form about 3.8 billion years ago
 
        
                    
             
        
        
        
Answer:
carrying capacity (carrying capacity is the total population size that a particular environment can comfortably support with little increase or decrease over a relatively long period of time) given the food, habitat, water e.t.c. that is available in the environment.