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For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

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Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..

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This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..

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Primitive Animals

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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The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..

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Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..

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