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The Encyclopedia of Life is a free, online encyclopedia intended to document all of the 1.9 million living species known to science. It is compiled from existing trusted databases curated by experts and with the assistance of non-experts throughout the world.

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Encyclopedia Britannica is one of the world's most renowned and comprehensive reference works. It is a reputable and authoritative source of knowledge, encompassing a vast array of information on a wide range of topics, including history, science, literature, art, and culture.

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