You are presented with the question "What passes energy up the food chain to adult vegans?" and the following answer choices: 
- cows
 - animals
 - Batteries.
 - chickens
 - Power companies.
 - glucose
 - Humans.
 - Plants.

Now knowing that energy is passed up a food chain or web from lower to higher trophic levels and plants represent the first trophic level, choose the best answer.


 

        Plants. 