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Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..

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Digestion and Absorption of Food

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This tutorial elaborates on the physical development of humans, particularly from puberty to adulthood. Read this tutori..

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Freshwater Ecology

Freshwater ecology focuses on the relations of aquatic organisms to their freshwater habitats. There are two forms of co..