To show how many organisms are present at each level of a food chain, ecologists use a model called
An energy flow pyramid
Pyramid of numbers
Pyramid of energy
Food chain/food web pyramid
Ecological pyramids are of
$A $ : Ecological pyramid of biomass is generally inverted in sea.
$R$ : Biomass of fishes far exceeds that of phytoplanktons.
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?
$A $ : Ecological pyramids cannot explain all the vital functions of any ecosystem.
$R$ : Pyramids actually does not explain the role of organisms working at more than one trophic levels.