Answer:
10 kcal.
Step-by-step explanation:
The third trophic level receives 10 Kcal from the second trophic level while on the other hand, 90 Kcal energy releases in the atmosphere in the form of heat energy. The producers has 1000 Kcal energy from which only 100 Kcal is transferred to the primary consumer or second trophic level while the remaining 900 Kcal releases in the form of heat energy in the atmosphere and then only 10 Kcal energy is transferred to third trophic level while the remaining 90 Kcal releases in the atmosphere.