Which sentence is grammatically correct?

Photosynthesis, the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.

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wearing a helmet reduces your risk of a serious brain injury and death because during a fall or collision, most of the impact energy is absorbed by the helmet, rather than your head and brain.

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