Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: The sun delivers power to the chemical factory chloroplasts.

Answer: What delivers power to the chemical factory chloroplasts?

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

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

Question: The force of attraction between a positively charged metal ion and the valence electrons it shares with other ions of the metal is called a(n) metallic bond.

Answer:
The force of attraction between a positively charged metal ion and the valence electrons it shares with other ions of the metal is called?