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While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..

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Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..

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Indicator Species and Endangered Species

Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..

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Plant Meristems and Growth

In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..

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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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Muscle cells are specialized to generate force and movement. Learn about the different types of muscle tissues in this t..