What is the branch of biology that deals with organisms living in the oceans?

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What is the branch of biology that deals with organisms living in the oceans? Answer: Marine Biology

Question context

This question is part of 📚 General Knowledge within the broader 🌐 Current Affairs & GK subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.