How can yeast cells can be considered single-celled organisms when they are still connected together.?

Yeast cells, particularly those in the Saccharomyces cerevisiae species, are considered single-celled organisms because each yeast cell operates independently and can reproduce on its own. Although they may form chains or clusters through budding, each cell retains its individual cellular structure and functions. This characteristic allows them to carry out metabolic processes independently, which is a defining feature of single-celled organisms. Thus, their physical connectivity does not negate their classification as unicellular entities.