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

Input: Consider Input: Exotic species are also called invasive species because they threaten other species.

Output: Why are exotic species also called invasive species?


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

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


Input: Consider Input: Vertebral column makes up the core of the endoskeleton.


Output: What makes up the core of the endoskeleton?