Generate a sentence that answers this question: "The mounds at the beach are made of".

Answer: sand dunes are made of sand

Generate a sentence that answers this question: "Sunlight is a source of light from what?".

Answer: the sun is a source of light called sunlight

Generate a sentence that answers this question: "Before their trip to the Amazon Bill and Jane had sharp metal objects stuck into their arms by a doctor.".

Answer:
vaccines can help prevent illness