कलेक्ट फोटोग्राफ्स और ड्रॉ डायग्राम ऑफ फाइव प्लांट्स ऑफ थैलोफाइटा डिविजन एंड राइट डिस्क्रिप्शन ऑफ़ इट
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Organisms with simple cellular structure and no division of labour are called
primitive.
Advanced organisms, like mammals have millions of cells and there are different organs and organ system for different biological functions.
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