In this model, which statement about the three pyramid types is best supported?
All three pyramid types must always narrow going up
The energy pyramid may narrow or widen depending on the web
Only the pyramid of numbers can be used to compare trophic levels
The energy pyramid always narrows; the other two narrow only in the typical case described here✓Bonne réponse
Explication
The ten percent rule forces the energy pyramid to narrow every time, whereas the statements about numbers and biomass in this model are claims about the typical case only. Saying that all three must always narrow fails because it asserts more than the model supports.