The respiratory loss of producers, herbivores and carnivores are respectively

Consider the following statements about ecological pyramids

$I.$ Charles Elton developed the concept of ecological pyramid

$II.$ After the 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?

Define ecological pyramids and describe with examples, pyramids of number and biomass.

The pyramid of number is based on