If resources from food are passed up a chain or web from lower to higher trophic levels, then what is passed up a chain or web from lower to higher trophic level?

Answer choices:
- Veins and arteries.
 - heat or cold
 - scarce resources
 - food resources
 - matter vibrating
 - rays or beams
 - Organic compounds
 - fossil fuels

 

    food resources      