Based on the typical structure of food webs:
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Tertiary Consumer: This is usually the top predator that is not preyed upon by other predators. In this case, the Lion is likely the tertiary consumer.
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Primary Consumer: These are herbivores that eat producers (plants). In this case, the Rabbit is the primary consumer.
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Producer: These are organisms that produce energy through photosynthesis, typically plants. Therefore, the Plant is the producer.
If you have a specific food web diagram in question, make sure to verify these answers in relation to that context.