Cell Membrane is the answer
        
                    
             
        
        
        
With every other lever 10% of the energy with be transferred. In this case: 
 Primary Producers (500)
 1) First- level consumer. (50) 
 2) Second-level consumer. (5)
 3) Third- level consumer. (0.5) 
Remember the formula is:
(Primary Producer) __units X 10%= __
In this case: 500 units X 10%= 50
        
             
        
        
        
Baryonic dark matter may occur in non-luminous gas or in Massive Astrophysical Compact Halo Objects, and stars. So therefore it’s D.
        
                    
             
        
        
        
I world say national park. because farming could be taking away from the biodiversity. where as the national park planning would be trying to help the biodiversity.
        
             
        
        
        
Answer: C- The atoms have different atomic numbers
Explanation: