Carbon based chemistry was successful in creating self replicating life on Earth and no other form of life has been found on Earth.
However other elements could potentially form similar molecules, Silicon is considered to be a god candidate.
It is possible that Silicon based life may evolve in other places in the Universe. It may even be possible that Silicon based life has existed on Earth but was out-competed by Carbon based life here.
Silicon based life and other potential chemistries are just a speculation.
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