What best describes the composition of soil

Humus and rock fragment best describes the composition of soil.

Explanation:

Besides that, soil also contains minerals, air, and water, usually  45% minerals, 20-30% water and 20-30% water. In a rainy reason amount of water increases and in sunny day its amount will be less. The Amount of air and water in soil is changing constantly. Humus is the organic compound that is formed from the decomposition of living organisms and dark and brown color. Soil provides home for various animals and also provides nutrients to plants.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.