The concept of ecological pyramids was given by

The concept of ecological pyramid was given by

Ecological pyramid were given by

The concept of ecological pyramids was introduced by

The concept of ecological pyramids was developed by :

(A) : The concept of ecological pyramid was developed by Arthur Tansley. (R) : An energy pyramid is always inverted.

Define ecological pyramids

The concept of ecological pyramid was first introduced by

Ecological pyramids are of

Define ecological pyramid.