Fact 1: Vesicle transport requires energy, so it is also a form of active transport.

Fact 2: Active transport requires a carrier molecule and a form of energy.

Given the two facts above, answer the question "Vesicle transport requires energy and a what?" with the following options: 
- activity
 - major threat to health
 - metabolic reaction
 - hydration
 - biofuel
 - wavelengths and photons
 - carrier molecule
 - Vibrations.


 

       carrier molecule  