You are presented with the question "What is passed up a chain or web from lower to higher trophic level?" and the following answer choices: 
- Veins and arteries.
 - heat or cold
 - scarce resources
 - food resources
 - matter vibrating
 - rays or beams
 - Organic compounds
 - fossil fuels

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


 

    food resources     