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when does a group of cells become a multicellular individual?

when does a group of cells become a multicellular individual?
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Organisms start out as a single cell and the cell proliferates to produce many more cells that result in the multicellular organism. Multicellular organisms arise in various ways: by cell division, aggregation of many single cells etc. The group of functionally specific cells aggregated into a slug-like mass (grex), which moved as a multicellular unit.

The first evince of multicellularity is from cyanobacteria-like organisms lived in 3–3.5 billion years ago. The unicellular organism depends upon just one cell for all of its functions while a multicellular organism has many cells that are specialized to perform different functions collectively support the organism.

When group of cells aggregate and specialised to specific functions, they become a multicellular individual.

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