Answer: False
Explanation: Microorganisms and humus have a great impact on the health and fertility of the soil. Microorganisms and humus belong to a group of biotic factors that contribute to the health of the soil. Biotic factors are all those things that were once alive and which by their decomposition contribute to the creation of humus and fertility of the soil, such as fallen leaves.
Humus is a dark matter formed by the dissolution of living organic matter, and contains many nutrients, the most important of which is nitrogen.
Microorganisms can be algae, fungi, bacteria and many others that contribute to the health of the soil.
There are also abiotic factors that contribute to the fertility of the soil, these are environmental factors such as temperature, sunlight, water.