GENERAL HISTOLOGY

Detailed explanation-1: -Are bacteria unicellular? Yes! In fact, not only bacteria are unicellular but also archaea. Both bacteria and archaea are prokaryotic organisms.

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.