D, a net transfer of energy
        
                    
             
        
        
        
Explanation:
All the human causes of global environmental change happen through a ... Three case studies illustrate the various ways human actions can contribute to ... It is possible to make such a division in numerous ways.
 
        
             
        
        
        
The correct answer is 'If molecules are small enough, then they can pass through the semipermeable membrane because they can cross the semipermeable membrane from their small pores or openings'.
The semipermeable membrane is permeable to few molecules, and the smaller molecules pass through the molecules from small pores present in the semipermeable membrane. The size of the big molecules are large, so, they cannot cross through semipermeable membrane. 
 
        
                    
             
        
        
        
Condensation is the formation of clouds.