Explanation:

- Charles Elton coined the term ‘pyramid of numbers’ in 1927, not 1972. He described how the number of organisms declines at each trophic level in a food chain.

- Eugene Odum was a prominent ecologist but did not develop the pyramid of numbers. He focused on ecosystem ecology and energy flow.

- Ernst Haeckel was a German biologist known for coining the term "ecology" but not "pyramid of numbers."

- Arthur Tansley introduced the concept of the ecosystem but is not related to the pyramid of numbers.