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B
Human, living organism and plants
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C
Humans and soil particles
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D
Human and microorganism
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Solution
The correct option is B Humus, living organism and soil The top most layer of soil is said to contain and support a lot of living organisms. It also has organic manure in it that supports the growth and development of plants.
So, option a "Humus, living organisms and soil" is the correct answer.