Given a statement, generate a question such that the answer is contained in that statement.

[EX Q]: h2o is essential for all plants on Earth
[EX A]: What is essential for all plants on Earth?

[EX Q]: cruising may require a compass.
[EX A]: What type of compass is required for cruising?

[EX Q]: In a human, the nerve pathways link the brain with motor neurons.
[EX A]:
What do nerve pathways link the brain with?