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The organic material of soil, made of decaying organisms, is called:

AHumus
BGravel
CPebble
DQuartz
Answer & Solution
Correct answer: A. Humus
1. Dead plants and animals break down in soil. 2. The dark organic residue has a name. 3. That residue is humus. _Source: OpenStax Biology 2e, Chapter 31, Soil and Plant Nutrition._
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