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Though Jablonski is more bullish on the survival prospects of unicellular life, there is some comfort for the multicellular among us too.

Yeast are unicellular fungi that ferment sugar into alcohol and carbon dioxide.

Its production takes place in the unique catalytic center of the unicellular algae and is only possible if certain cofactors of the relevant proteins are present.

For example, the researchers found evidence of "heterospecific killing," where a cell engulfs and kills a cell of a different species, across a wide range of unicellular, facultatively multicellular, and obligate multicellular organisms.

Macroalgae live in both fresh and seawater and are complex multicellular organisms with distinct organs and tissues, in contrast to microalgae, which are microscopic and unicellular.