Give scientific reasons: Energy pyramids are never inverted.

What type of ecosystem is represented by the given ecological pyramid?

The pyramid of biomass in the sea is generally inverted because...

In a forest ecosystem,the pyramid of numbers is:

Consider the following statements about ecological pyramids:
$I.$ Charles Elton developed the concept of ecological pyramid.
$II.$ After his name,these pyramids are also called as Eltonian pyramids.
$III.$ It is a graphical representation or pyramid-shaped diagram which depicts the number of organisms,biomass,and energy at each trophic level.
Which of the statements given above are correct?

Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?