Basic unit of taxonomic hierarchy is

The correct option/answer is "species".

Step-by-Step Explanation:

Taxonomic hierarchy is the process of arranging various organisms into successive levels of biological classification in either a decreasing or an increasing order from kingdom to species, and vice versa. Each level of this hierarchy is called a taxonomic category or rank.

The taxonomic categories in descending order are:
1. Kingdom (highest, most inclusive level)
2. Phylum (for animals) / Division (for plants)
3. Class
4. Order
5. Family
6. Genus
7. Species (lowest, most specific level)

The species is the basic, lowest, and most fundamental unit of taxonomic classification. It consists of a group of individual organisms that share maximum common characteristics and are capable of interbreeding to produce fertile offspring.