Energy is passed up a food chain or web from lower to higher trophic levels, and food gives energy. Given these facts, what is passed up a chain or web from lower to higher trophic level among the following options:
- Veins and arteries.
 - heat or cold
 - scarce resources
 - food resources
 - matter vibrating
 - rays or beams
 - Organic compounds
 - fossil fuels


 

    food resources     