Fact 1: Hormones control many cell activities, so they are very important for homeostasis.

Fact 2: Hormones travel in the bloodstream to cells that are called target cells a.

Given the two facts above, answer the question "what allows molecules to travel to control many cell activities" with the following options: 
- skin
 - heat energy
 - animal transport
 - bloodstream
 - Chemical energy
 - nasal passage
 - movement
 - fat tissue


 

    bloodstream     