Question:
Use evidence from the fact that the vanes rotating in an electric fan causes air to move to answer the following question. "Which causes the electric fan to work?"

Answer:
power outlets allow the blades to rotate

Question:
Use evidence from the fact that the moon does not contain water to answer the following question. "the moon is lacking what?"

Answer:
h2o

Question:
Use evidence from the fact that sound can be used for communication by animals to answer the following question. "Sound can be used for communication by"

Answer:
creatures