sentences: forming a carbohydrate requires certain land digestion
docs: ribose is carbohydrate. tundra is grass_land. carbohydrate is nutrient. pollen_grain is gametophyte. carbohydrate_loading is diet. carbohydrate is organic_matter. wood_sugar is carbohydrate. carbohydrate is molecular_material. cereal has lots_of_carbohydrates gastric_digestion is digestion.