Sun helps photosynthesis.
Meaning: This means that the light from the sun is essential for plants to produce their own food through photosynthesis.
Choice of Words: Sun is the star at the center of our solar system. Helps is a verb that means to make it easier for someone to do something. Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll pigments. In this context, it means that the sun's light is necessary for photosynthesis to occur in plants.
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