Hemoglobin is an iron-rich protein in red blood cells that binds to oxygen and gives blood its characteristic red color.
Red color of human blood is due to the presence of:
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This question is part of 🔬 General Science 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.