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

[Q]: Mountain sheep have _ sharp teeth at the front of the mouth.
[A]: eight

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

[Q]: External radiation is given in divided doses to the pelvis _ days a week for five weeks.
[A]:
five