Answer:
90% of carbon that is not passed to the next trophic level when a primary consumer takes in energy from a producer is lost as heat or used up by the body.
Explanation:
In the pyramid of energy, energy decreases as an organism move from one tropic level to the next. Only 10% of the energy at any trophic level is transferred to the next level.
The 10% consumed by an organism is stored in the body, the remaining 90% is lost as heat or used up for growth, reproduction, etc
