According to linnaean taxonomy, the most specific category and level shared by humans, gorillas, and howler monkeys is

According to Linnaean taxonomy, the most specific category and level shared by humans, gorillas, and howler monkeys is - Suborder Anthropoidea

Taxonomy is the system of classifying and naming organisms that was invented by Carolus Linnaeus. He also created a hierarchical system of classification of nature which includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.