Could a space-dwelling creature survive solely off of sunlight?

On Earth, photosynthetic organisms require additional nutrients to survive; in addition to "feeding" off of sunlight, plants respire and absorb water from the ground in order to grow.

However, the Earth is a closed system chemically speaking, so fundamentally all chemical resources are recycled through the biosphere. Would it be possible for this process to take place within a single organism, such that the only input the creature needed was sunlight to provide energy for its chemical processes?

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Could a space-dwelling creature survive solely off of sunlight?

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