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This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..

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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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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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Obtaining air outside an aquatic environment required species to acquire suitable adaptations, and this was the case of ..