CORRECT answer is Farmer. Relationship between soil and biodiversity:Biodiversity is "the variety of life: the different plants, animals and micro-organisms, their genes and the ecosystems of which they are a part."Biodiversity and soil are strongly linked, because the soil is the medium for a large variety of organisms, and interacts closely with the wider biosphere. Conversely, BIOLOGICAL activity is a primary factor in the physical and chemical formation of soils.Soil provides a vital habitat, primarily for microbes (INCLUDING bacteria and fungi), but ALSO for microfauna (such as protozoa and nematodes), mesofauna (such as microarthropods, and enchytraeids), and macrofauna (such as earthworms, termites, and millipedes).The primary role of soil biota is to recycle organic matter that is derived from the "above-ground plant-based food web".How does a farmer know better the relationship between Soil and Biodiversity?The lack of sustainability of agro-systems causes environmental degradation in the form of loss of the productive capacity of the soil, reduction of biodiversity, and damage to water supply and quality.The farmer grows diverse CROPS in his field. He knows the better relationship between soil productivity and the crop. Pedologists know the soil characteristics only, biologists know the microbes and organisms related to soil.