Carbohydrate macromolecules, or Polysaccharides
        
                    
             
        
        
        
Cells communicate through their own language of chemical signals. Different compounds, such as hormones and neurotransmitters, act like words and phrases, telling a cell about the environment around it or communicating messages.
        
             
        
        
        
I think it’s called nutrients
        
                    
             
        
        
        
D. about every 3 to 7 years
        
                    
             
        
        
        
Brown fields are property redevelopment