EVERYDAY SCIENCE

Detailed explanation-1: -Bacteria are not multicellular. They are unicellular organisms, possessing only one cell. All functions required to sustain life like growth, metabolism, reproduction, etc are carried out by a single cell in bacteria.

Detailed explanation-2: -Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. Unicellular organisms include bacteria, protists, and yeast.

Detailed explanation-3: -Bacteria and archaea are single-celled, while most eukaryotes are multicellular.

Detailed explanation-4: -Many bacteria have a multicellular phase of their lifecycle, which fall into three broad categories based on shape and mechanism of formation. A number of pressures may have selected for multicellularity, including physicochemical stress, nutrient scarcity, predation, and environmental variability.