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

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

A: What diagnostic technology uses high-frequency vibrations transmitted into any tissue in contact with the transducer?
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Q: Carried through body happens if cancer cells enter the blood stream.

A: What happens if cancer cells enter the blood stream?
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Q: Evolution process consists of the mechanisms that produce an observed pattern of change.

A:
What process consists of the mechanisms that produce an observed pattern of change?
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