In a food chain a trophic level represent a functional level , not a species. Explain.

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A trophic level represents a functional level, not the species. ​This is because at a given time, a species might occupy more than one trophic level in the same ecosystem. e.g. a sparrow acts as a primary consumer (trophic level) when it eats fruit, seeds etc. but when it eats insects and other small organisms, it acts as a secondary consumer (another trophic level).
So, we cannot associate a trophic level with a certain species.
 
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