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The blank in soil comes from decaying plants and animals and their waste products

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Answer:

HUMUS

Step-by-step explanation:

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. This material is called leaf litter. When animals die, their remains add to the litter.Jan 31, 2011

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