Venus has a dense and very hot atmosphere. Therefore there were no evidence of water on its surface. I believe life may exist underground like Jules Verne's "Voyage au Centre de la Terre". Almost constant and cool temperatures underground would allow water to condense. As a result organisms that do not need sunshine to grow may live like fungi. Animals who feed on non-photosynthetic plants and also do not need sunshine would also survive in such an ecosystem (ex: deep sea creatures).
As a conclusion where there is energy there is life. Too cold planets would only have very small organisms if there is any.
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