Hormones control many cell activities, so they are very important for homeostasis, and hormones travel in the bloodstream to cells that are called target cells a. Given these facts, what allows molecules to travel to control many cell activities among the following options:
- skin
 - heat energy
 - animal transport
 - bloodstream
 - Chemical energy
 - nasal passage
 - movement
 - fat tissue


 

    bloodstream     