Answer:
6.845
Explanation:
Typically only 10% of energy is transferred from the tropic level to the next, with the rest being used for metabolism, growth and lost of heat.
2nd tropic level: 68,450.
Food chain has 6 tropic level s.
let's calculate the energy at the third to sixth level.
Third: 10% ×6,8450
= 0.1 × 68450
= 6,845
Fourth: 0.1 × 6,845
= 684.5
Fifth : 0.1 × 684.5
=68.45
Sixth: 0.1 × 68.45
= 6.845
