Explanation:
Bio-indicators include biological processes, species, or communities and are used to assess the quality of the environment and how it changes over time. For examples, microbial biomass, fungi, actinomycetes, lichens, as well as the population of earthworms, nematodes, termites and ants can be used as bio-indicators on account of their important role in nutrient cycline, specific soil fertility, soil development, and soil conservation (Anderson, 2003).