Innate immunity had two components first line of defence and second line of defence. Which one of the following is not second line of defence?

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Innate immunity had two components first line of defence and second line of defence. Which one of the following is not second line of defence? Answer: Mucus

Question context

This question is part of 🦠 Microbiology within the broader 🧬 Medical Science subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.