Who introduced 'Ecological pyramids'?

Who introduced pH ?

Which one of the following is not used for construction of ecological pyramids?

Name the scientist with the help of the paragraph. He was a British ecologist. In the year 1927, he introduced the concept of 'ecological pyramids'.

Observe the pictures given below. Fig A indicates pyramid of Egypt and Fig B indicates Ecological pyramid. Explain which type of ecological pyramid is this . Name some kinds of ecological pyramids..

The organisms which are not represented in ecological pyramids are

Who introduced elliptical orbits ?

Ecological niche is

What is an ecological pyramid?

The concept of ecological pyramid was first introduced by