Species is a taxon in which organisms belonging to this taxon interbreed among themselves to produce fertile offsprings. so it is considered as the lowest unit of classification.

Introduction:
In the field of taxonomy, species play a crucial role as they are the fundamental units of classification. They represent a group of organisms that share similar characteristics and have the ability to interbreed. However, there are different interpretations and definitions of species, which can sometimes lead to confusion.

Explanation:
Species as real basic units of classification:
Species are considered as real basic units of classification because they represent a distinct group of organisms that share common characteristics and can interbreed. Taxonomists use species as a fundamental category for organizing and classifying living organisms. They are recognized as the smallest and most basic unit of classification in taxonomy.

Species as the lowest units of classification:
Species can also be considered as the lowest units of classification because they are the most specific category within the hierarchical classification system. Taxonomy organizes living organisms into a hierarchical structure, starting from the broadest category (domain) down to the most specific category (species). Therefore, species represent the lowest level of classification in this system.

Species as real units of classification devised by taxonomists:
Taxonomists, who are scientists specializing in the classification of organisms, devise and define species based on various criteria. These criteria may include morphological characteristics, genetic differences, and reproductive compatibility. Taxonomists aim to create a classification system that accurately reflects the relationships and diversity of living organisms. Therefore, species are not just arbitrary divisions but are real units of classification devised by taxonomists.

Species as an artificial concept of the human mind:
While species are considered real units of classification, it is important to acknowledge that the concept of species is a human construct. The boundaries and definitions of species can vary depending on the perspective and criteria used. Some species concepts focus on reproductive compatibility, while others emphasize genetic or morphological differences. Therefore, the concept of species is not absolute and can be subject to interpretation and debate.

Conclusion:
In conclusion, species are considered as real basic units of classification in taxonomy. They represent distinct groups of organisms that share common characteristics and have the ability to interbreed. Taxonomists devise and define species based on various criteria. While the concept of species is a human construct, it serves as an essential tool for organizing and understanding the diversity of living organisms.