Answer:
Breaking the bonds in a monosaccharide 
Explanation:
apex
 
        
             
        
        
        
Answer:
C. Cholesterol
Explanation:
Cholesterol maintains the fluidity of the cell membrane and thereby, regulates its function.
Bile acids are derived from cholesterol which serves as their precursor. For example, Taurocholic acid is a polar derivative of cholesterol. Bile acids serve in the absorption of fatty acids, glycerol, and fat-soluble vitamins as these compounds are non-polar in nature.  
Vitamin D is produced when the derivative of cholesterol, 7-dehydrocholesterol undergoes photolysis in skin cells in presence of sunlight.  
 
        
             
        
        
        
Explanation:
If the concentration of molecules outside the cell is very high relative to the internal cell concentration, the rate of diffusion will also be high. If the internal and external concentrations are similar (low concentration gradient) the rate of diffusion will be low.
 
        
             
        
        
        
Answer:
C: Earth scooped out that can form a lake or deep valley