Final answer:
In the system of taxonomy, the domain level is the most inclusive, encompassing all other levels like family, class, order, species, and genus.
Step-by-step explanation:
The level of taxonomy that encompasses all of the other levels mentioned in the question is the domain. In the taxonomic hierarchy, the arrangement from most specific to most inclusive is: species, genus, family, order, class, phylum, kingdom, and domain. Species are the most specific and domains are the broadest category encompassing all other life forms.