Cells -> Tissues -> Organs -> Organs systems -> Organisms
        
             
        
        
        
Answer:
Grass
Explanation:
since producer is the first thing in the food chain its grass
 
        
             
        
        
        
A. You improve your health by setting as many goals as you can
        
                    
             
        
        
        
Answer:
A tight junction is a watertight seal between two adjacent animal cells, which prevents materials from leaking out of cells.
Explanation: