What is the primary source of food for marine life?

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What is the primary source of food for marine life? Answer: Phytoplankton

Question context

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