Which best describes the functional role of cyclic adenosine monophosphate?

The cyclic adenosine monophoaphate, or the cAMP is a second messanger for multiple biological processes. The glucose, sugar and lipid metabolism is regulated by the cAMP or cyclic adenosine monophosphate. Itis the derivative of the ATP (Adenosine Triphosphate), and used for the purpose of the signal transduction. Besides this, the brain function is also affected by the cAMP.

b. lithosphere, asthenosphere, mesosphere   is the answer most likely

not only is it colder, it also becomes darker, less salty, and more dense.