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What are the key biological processes that depend on the presence of water vapor on exoplanets?

    Water vapor is a crucial component for supporting various key biological processes on exoplanets. Firstly, it plays a vital role in the water cycle, which involves evaporation, condensation, and precipitation. This cycle facilitates the movement of water and nutrients across the planet, enabling the growth of plants and the survival of organisms. Water vapor is also important for regulating temperature through its greenhouse effect, preventing extreme temperature fluctuations and creating a stable environment for life. Additionally, water vapor acts as a solvent, allowing for the dissolution and transport of essential nutrients and molecules within organisms. It is also involved in biochemical reactions as a reactant or catalyst, participating in various metabolic processes necessary for life.

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