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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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Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..

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Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

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A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, G..

Evolution of Life - Ancient Earth
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Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..

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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..