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

Fact 2: Active transport involves movement of substances against a chemical gradient.

Given the two facts above, answer the question "Why does vesicle transport need energy? " with the following options: 
- it helps plants in growing
 - to prevent movement
 - for movement of substances
 - during the day
 - Transfers energy
 - flow of electrons
 - to breath
 - magnetism


 

   for movement of substances      