Life starts from a single cell called a zygote. It divides repeatedly through mitosis to form many cells. These cells differentiate into tissues organs and organ systems, eventually developing into a complete multicellular organism with specialised functions.
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In multicellular organisms, specialised cells form tissues, tissues form organs and organs form systems. Each structure performs particular functions efficiently. This division of labour improves coordination, reduces workload on individual cells and enables organisms to perform complex life processes successfully.