In general, uploading a C. elegans, i.e. creating an abstract artificial worm? Entirely doable. Will probably be done in not-too-distant future.
Uploading a particular C. elegans, so that the simulation reflects learning and experiences of that particular animal? Orders of magnitude more difficult. Might be possible, if we have really good technology and are looking at the living animal.
Uploading a frozen C. elegans, using current technology? Again, you might be able to create an abstract worm, with all the instinctive behaviors, and maybe a few particular...
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