instruction:
Given a statement, generate a question such that the answer is contained in that statement.
question:
Semen pass out of the body through a single tube that runs to the penis.
answer:
What does semen pass out of the body through?


question:
Sensation is caused by sensory nerve cells
answer:
What causes Sensation?


question:
Non-vascular plants play vital roles as producers in aquatic ecosystems.
answer:

What plants play vital roles as producers in aquatic ecosystems?