It is true because scientists often do that
        
                    
             
        
        
        
Answer:
By definition, tissues are absent from unicellular organisms. Even among the simplest multicellular species, such as sponges, tissues are lacking or are poorly differentiated. But multicellular animals and plants that are more advanced have specialized tissues that can organize and regulate an organism’s response to its environment.
 
        
             
        
        
        
Answer:
The answer is juxtamedullary nephrons. Hope this helps.