Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Ex Input:
Hybridization model model helps explain molecules with double or triple bonds.

Ex Output:
Which model helps explain molecules with double or triple bonds?

Ex Input:
Ultrasound, a diagnostic technology, uses high-frequency vibrations transmitted into any tissue in contact with the transducer.

Ex Output:
What diagnostic technology uses high-frequency vibrations transmitted into any tissue in contact with the transducer?

Ex Input:
Oxygen element do plants use to store energy as atp.

Ex Output:
What element do plants use to store energy as atp?