Cell communication evolved before the emergence of multicellular organisms. The first organisms were unicellular.
The first unicellular organisms appeared on Earth approximately 3 billion years ago.
Multicellular eukaryotic organisms such as plants and animals evolved from these unicellular prokaryotic life forms.
In consequence, the observation that eukaryotic organisms and prokaryotic organisms (e.g., bacteria) share similar cell-signaling processes suggests that this cellular feature evolved from a common ancestor.
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