sentences: a leaf absorbs sunlight to perform photosynthesis
docs: photosynthesis is process. leaves is green_because_absorb_red_light. leaf is device_for_absorbing_light. photosynthesis is photo_chemical_process. photosynthesis is chemical_process. simple_leaf is leaf. plants has leaves_to_gather_light general_photosynthesis is production. photosynthesis is process_by_which_leaf_makes_food.