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Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up. ... The thick brown or black substance that remains after most of the organic litter has decomposed is called humus.
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Humans (Homo sapiens) are the most abundant and widespread species of primate, characterized by bipedalism and large, complex brains. ... Although some scientists equate the term humans with all members of the genus Homo, in common usage, it generally refers to Homo sapiens, the only extant member.
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