what allows molecules to travel to control many cell activities
skin heat energy animal transport bloodstream Chemical energy nasal passage movement fat tissue
A B C D E F G H
Hormones travel in the bloodstream to cells that are called target cells a.
the bloodstream allows molecules to travel to control many cell activities 
what allows molecules to travel to control many cell activities (A) skin (B) heat energy (C) animal transport (D) bloodstream (E) Chemical energy (F) nasal passage (G) movement (H) fat tissue