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The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..

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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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Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..

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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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Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..

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