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

Starches are complex carbohydrates that are the polymers of glucose.
What complex carbohydrates are the polymers of glucose?

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

The earliest known mammal fossils are from early jurassic period.
The earliest known mammal fossils are from which period?