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Growth and Development of a Human Baby

Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..

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Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..

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This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

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Vascular Plants: Ferns and Relatives

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

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Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..

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Chromosomes X and Y and Sex Determination

This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..