Microorganisms can improve soil health, but do not play a crucial role in it

Microorganism play a very crucial role in improving the soil health. Soil microbes help in the formation of humus from the plant and animal parts in the soil. Humus increases the nutrient in the soil and make it healthy. Microbes affect the amount of organic matter in the soil and also helps in maintaining the soil structure by supplementing minerals and nutrients in it.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.