Answer:
90%.
Explanation:
The energy is lost in the ecosystem as we moves upward in the tropic level. Only the 10% energy is available to the next tropic level. This is known as the 10% law of energy.
As only the 10% energy is available to the ecosystem, the remaining energy is lost as form of heat. The 90% energy is lost in the ecosystem in the form of heat during respiration and excretion and digestion of the metabolism. Hence, the loss of amount energy is 90%.
Thus, the answer is 90%.
