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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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There are more species of insects than any other species combined. This surely illustrates that insects have the selecti..

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Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..

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This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..