Solve your doubts and expand your knowledge with IDNLearn.com's extensive Q&A database. Ask anything and receive prompt, well-informed answers from our community of knowledgeable experts.
Answer:
a.
Explanation:
. Humus forms from fallen leaves, dead wood, and other dead organic matter.
Humus is formed by the decomposing action of soil microorganisms which break down animal and vegetable material into elements that can be used by growing plants