Hunter-gatherer societies are often nomadic. I believe.
 
        
                    
             
        
        
        
A biochemical cycle that is well know to everyone is the water cylce
        
             
        
        
        
Unicellular organisms are living things made up of only one cell. For example, bacteria and yeast are unicellular. Multicellular organism are made up of more than one cell. Some examples of a multicellular organisms are humans and animals.