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]: Carbon dioxide extinguishes fire by physically attacking all _ points of the fire triangle.
[A]: three

[Q]: China is located in eastern Asia and spans more than _ million square kilometers.
[A]:
nine