Answer:
Escherichia coli bacterium, Streptococcus bacterium, Sulfolobus acidocaldarius archeobacterium, streptococcus pyogenes, lactobacillus acidophilus, Cyanobacteria, Archaea. Do you need more?
If one cell of multicellular organism is on it's own, it can not survive, because it is made to be with other cells, so if a heart cell was on its own, it would die instantly cause there is no way to breathe oxygen
