Answer:
B) cAMP
Explanation:
Phosphodiesterase is an enzyme that breaks a phosphodiester bond, for example in molecules such as cAMP and cGMP. So, phosphodiestarases are  are regulators of signal transduction: regulate the duration of signaling pathway.
Caffeine is  central-nervous-system stimulant and the mechanisms of its action usually are: mobilization of intracellular calcium or inhibition of specific phosphodiesterases.
 
        
             
        
        
        
I think the correct answer among the choices listed above is option C. The correct order of organizations of structures in living things from simplest to most complex should be c<span>ells as the most basic unit of life, Tissues, Organs and Organ Systems. Hope this answers the question.</span>
        
                    
             
        
        
        
Answer:
Complete dominance Result from successive mutations of the same GENE.
Explanation:
 
        
                    
             
        
        
        
There is only two possible offspring. 
Bb and bb
Homo is the same 
Hetero is different
              b               b
 B      <u> Bb </u>              <u> Bb</u>
     
b       <u> bb  </u>               <u> bb </u>
                               
 
        
             
        
        
        
Answer:
I am guessing The second Cause only petroleum stay in the top of water