Biology / Bio 3641 · Atom · ~20 seconds
Trophic Levels and Food Chains
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A trophic level groups organisms by feeding position: producers occupy the first level, primary consumers the second, successive levels each consuming the level below.
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Grass is the producer level, a grasshopper eating grass the primary consumer, a bird eating the grasshopper the secondary consumer.
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One organism can occupy different trophic levels — an omnivore eating plants and animals spans more than one.