The first scientist to formally classify living organisms in a way that is still recognized today was Carl Linnaeus, a Swedish botanist, physician, and zoologist.

He developed a system of classifying organisms based on their shared characteristics, which is known as Linnaean taxonomy. This system uses a hierarchical classification, with organisms grouped into increasingly specific categories:

* Kingdom

* Phylum

* Class

* Order

* Family

* Genus

* Species

Linnaeus's work, published in his book Systema Naturae in 1735, laid the foundation for the modern system of biological classification and is still used as a basis for understanding the relationships between living things.