Which energy pyramid cannot be inverted?
a. pyramid of numbers
b. pyramid of biomass
c. pyramid of energy
d. all can be inverted

The answer is C. Pyramid of energy

Both Pyramid of numbers and Pyramid of biomass can be inverted, but Pyramid of energy will always stay upright

In pyramid of energy, the 1st level floor of the pyramid will pass 10 % of its energy to the 2nd floor, then the 2nd floor will passed 10% of its energy to the 3rd level and so on

If it's inverted, there would be insufficient energy to pass to begin with, making it really inefficient

The answer to your question is  it relieves stress and boredom.  the rest of the answer choices would be long term.