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

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The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

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Regulation of Biological Systems tutorials are focused on the modulation of biological systems from cell to population l..

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Myelin sheath is essential for a faster conductivity of signals. Know more about this feature of some neurons in the Cen..

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Amphibians & Early Reptiles

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