Discussion
The pyramid of energy in any ecosystem is
Answer: A
The pyramid of energy is always upright.
The pyramid of energy shows the flow of energy through successive trophic levels. At each transfer most of the energy is lost as heat in respiration, and only about 10 percent passes to the next level (Lindeman's ten percent law). Energy at each level is therefore always less than at the level below, so the pyramid can never be inverted.
Pyramids of number and biomass can be inverted, for example a single tree supporting many insects, or phytoplankton in the sea, which is the trap in the other options.
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