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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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Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..

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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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The Evolutionary Development of Multicellular Organisms

Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..

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Takahē (Porphyrio hochstetteri)

Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

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