Identify the possible line “A” in the following food chain:Plant $\to$ insect $\to$ frog $\to$ “A” $\to$ Eagle

In this terrestrial food chain, the sequence represents energy flow from primary producers to top carnivores. A frog (secondary consumer) is typically eaten by a snake (Cobra), which in turn is eaten by an Eagle (quaternary consumer). Parrots and Rabbits are herbivores.