Hormones control many cell activities, so they are very important for homeostasis, and homeostasis is the central theme of physiology. Given these facts, what is hormones controlling cell activities important to among the following options:
- gravity
 - it helps plants in growing
 - the sun
 - central theme of physiology
 - female sex cells
 - density
 - Generating heat
 - production of energy


 

    central theme of physiology     