Caffeine will block the action of phosphodiesterase and thus the enzyme will not be activated to break down cAMP.
Caffeine has some effects which are psychological in nature. At the cellular level, caffeine blocks the action of phosphodiesteerase. Phosphodiesterase is the one that break down the cAMP inside the cell.
        
             
        
        
        
Answer:
Collenchyma is a supporting tissue composed of more or less elongated living cells with unevenly thickened, nonlignified primary walls.
Aerenchyma is a modification of the parenchyma to form a spongy tissue that creates spaces or air channels in the leaves, stems and roots of some plants, which allows exchange of gases between the shoot and the root.
Explanation:
 
        
             
        
        
        
the answer is true that 50% ecosystems are currently being used unendurable. 
 
        
             
        
        
        
Answer: a, d, f, h
Explanation:
The other ones pertain to meiosis 1 and 2
 
        
                    
             
        
        
        
C is the correct answer to this question