Final answer:
The hierarchical model to classify organisms is used by taxonomy, which ranks living organisms from general to specific levels such as domains down to species. It is based on the Linnaean system and is crucial for organizing life forms.
Step-by-step explanation:
The hierarchical model to classify organisms is used by taxonomy. This system, also known as the Linnaean system after Carl Linnaeus, organizes living organisms into a hierarchy from the most general to the most specific. Starting with the largest categories called domains, which include Bacteria, Archaea, and Eukarya, each domain is further divided. Following domains, the next levels of classification in increasing specificity are: kingdom, phylum, class, order, family, genus, and species.
Most biologists subscribe to a cladistic approach considering evolution's pattern as a series of diverging clades, represented in a branching diagram. However, some organisms result from the merging of different clades, challenging both cladistic methods and hierarchy. But in terms of organizing life, taxonomy's hierarchical model remains crucial.
In conclusion, the correct answer to which field uses a hierarchical model to classify organisms is b) Taxonomy.