World's largest unicellular organism lives in the oceans

The oceans are home to innumerable creatures, from minute bacteria to the mighty blue whale.

- ABHIJEET KABAD

Amid this, there are various unicellular organisms which exist. These organisms have a single cell, which contains the DNA, cytoplasm and organelles required for survival. All major life processes like respiration, digestion and reproduction are carried out within the single cell. There are mainly two categories -- prokaryotic and eukaryotic. The difference between the two is that prokaryotic organisms lack a nucleus, while eukaryotic organisms have one. These organisms can survive in a broad range of environments.