Answer:
A. 10%
Explanation:
Organisms require energy to survive; however much of this energy is used up in day-to-day processes. 10% of this energy is left to move to the next trophic level in an ecosystem.
Most of the energy is used up in the metabolic processes and the rest of the energy is utilized in the day to day survival. Only as much as 10% energy is left to be transferred to the next trophic level.
