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Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..

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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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This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read..

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Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...

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Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..