sentences: green plants provide food for themselves / animals / consumers by performing photosynthesis
docs: animals is food. tomatoes is food. color_of_fish is function_of_fish's_survival. lettuce is food. corn is plant_and_food. produce is food. trees is green_plants. blueberries is food. plants has leaves_to_gather_light photosynthesis is process_by_which_leaf_makes_food.