In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Sturgeons are shark-like in form but are unique in having _ rows of bony plates along the body.

A: five
****
Q: Most people stay in a nursing home for less than _ years.

A: four
****
Q: Prosthodontists typically train for _ years to learn the best ways to restore dental implants.

A:
three
****