The birds feed on insects, thus, they will occupy the B level of the pyramid. D would represent corn and C would represent the insects that feed on corn. The A-level will be represented by a predator which feeds on birds.
What is pyramid in ecology?
An ecological pyramid is defined as the graphical representation of the relationship between the different living organisms at different trophic levels.
A lot of times, humans finished up in A level because people are the primary consumers of various animals and even vegetables.
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