There are no planets made of carbon dioxide. The
planets that have significant amounts of carbon
dioxide in their atmospheres are Venus and Mars.
Life as we know it cannot exist on Venus. It could
exist on Mars; protected below the surface where
water can still be liquid (it's a pressure-thing).
Just because it could be there does not mean that
it is, however, and thus far the evidence of
Martian life remains ambiguous.
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