If consciousness is due to "correlates of consciousness", then a slightly modified correlate will maintain consciousness.  If M neurons can be conscious then M-1 can be too.   If M-1 can be conscious then M-2 can be too.  Thus, any number of neurons can be conscious.  Furthermore, if a neuron can be conscious, then a slightly modified neuron can be also.  Following a similar argument, a neuron can be transformed into any other object while incrementally maintaining consciousness.  Therefore, a rock can be conscious.  So, any biochemical process can exhibit consciousness.
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