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Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..

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

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Origins of Life on Earth

Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

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Regulation of Biological Systems

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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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Plants are responsible for incredible feats of molecular transformation. Plant processes, such as photosynthesis, photop..