You are presented with the question "what are passed up a food chain or web from lower to higher trophic levels?" and the following answer choices: 
- calories
 - Light
 - atmosphere
 - DNA
 - heat
 - fossil fuels
 - animals
 - photons

Now knowing that energy is passed up a food chain or web from lower to higher trophic levels and calories are units of energy, choose the best answer.


 

 calories        