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

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Mutations can also influence the phenotype of an organism. This tutorial looks at the effects of chromosomal mutations, ..

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Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..

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Following nine months inside the mother's womb is the birth of the baby. Know the different stages of the birthing proce..

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Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..