Here's why:

* Multicellular is a descriptive term, not a taxonomic classification. It describes organisms that are made up of more than one cell.

* Scientific names are used to identify specific species, like *Homo sapiens* for humans.

* Taxonomic classification groups organisms based on their shared characteristics, like Kingdom, Phylum, Class, Order, Family, Genus, and Species.

Examples of multicellular organisms with their scientific names:

* Humans: *Homo sapiens*

* Dogs: *Canis lupus familiaris*

* Trees: *Quercus* (genus)

* Mushrooms: *Agaricus bisporus*

So, instead of a single name, "multicellular" describes a broad category of life that encompasses a vast array of species with their own unique scientific names.