Snails are present in most of the world, so it is not a surprise to discover that they dwell in diverse habitats. Some of them are comfortable in the desert while others live in ditches and cooler climates. These include mountain areas and even marshes
        
             
        
        
        
Integumentary system I believe
        
                    
             
        
        
        
There is only species of a koala but you can ask how many races there are.
The name is, "phascolarctos cinereus".<span />
        
             
        
        
        
Ecosystems can be large and are made of biomes. Some examples of ecosystems are deserts and forests.