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

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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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Still Freshwater & Plants

Plants in lentic habitats have features not found in terrestrial plants. They acquired these features as they adapt to t..

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Population Regulation in an Ecosystem

With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

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This tutorial elaborates on the physical development of humans, particularly from puberty to adulthood. Read this tutori..