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Cells in a multicellular organism are organised into a hierarchy. The correct order from smaller to larger is:

AOrgan → Organ system → Tissue → Cell
BCell → Organ → Tissue → Organ system
CTissue → Cell → Organ → Organ system
DCell → Tissue → Organ → Organ system
Answer & Solution
Correct answer: D. Cell → Tissue → Organ → Organ system
Cell (basic unit) → Tissue (similar cells doing same function — e.g. muscle tissue) → Organ (multiple tissues working together — e.g. heart) → Organ system (multiple organs — e.g. respiratory system: nose, trachea, lungs) → Organism (entire body).
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