Answer:
Domain.
Step-by-step explanation:
In Science, this biological classification of living organisms based on similarities or characteristics such as eyes, number of legs, etc., is generally referred to as taxonomy.
Taxonomy can be defined as the process of naming, classification and description of living organisms such as plants and animals.
Basically, the eight (8) biological classification (taxonomy) used for grouping and organizing organisms are; kingdom, domain, phylum, family, order, class, species and genus.
Hence, taxonomy helps scientist to have a good understanding and knowledge when studying various organisms.
Furthermore, the broadest, least specific level of the biological classification of living organisms is domain. The three (3) domain in which living organisms can be classified are: Bacteria, Eukaryote, and Archaea.