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

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


[Q]: Most amphibians reach maturity at three or _ years.
[A]: four


[Q]: Hexapods comprise insects and _ small orders of insect-like animals with six thoracic legs.
[A]:
three