Earthworm
Man
Rodent
Microbes
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Yes, microbes can contribute to the conservation of soil fertility. Microbes such as bacteria and fungi play an essential role in the soil ecosystem by decomposing organic matter, which releases nutrients that are then available for plant growth. They also help in the formation of soil aggregates, which improve soil structure and water retention capacity. Some microbes also form symbiotic relationships with plants, such as mycorrhizal fungi, which aid in the uptake of nutrients by the plants. Additionally, certain types of bacteria can fix atmospheric nitrogen, making it available for plant use. Overall, the presence and activity of microbes in soil are critical for maintaining soil fertility.

Earhworm brings nutrient from the upper most layer of the soil to the root or ground

the correct ans is A earthworm, microbes like some bacteria and fungi take part mainly in nutrient cycling and some of them may cause plant diseases unlike like earthworms which directly affect the soil fertility and structure by aerating the soil and decomposing organic materials

wrong answer
microbes do not directly improve the soil.
correct answer is earthworm they aerate the soil and add calcium salts to the soil

