Generate a sentence that answers this question: "In a plant such as a cactus, water is held within".

Answer: a plants require water for to grow

Generate a sentence that answers this question: "In the food chain process fungi have the role of what?".

Answer: In the food chain process fungi have the role of decomposer

Generate a sentence that answers this question: "Obstacles that might impede a dune are".

Answer:
sand dunes are made of sand