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

[EX Q]: Cubs emerge from the den when they are four to _ months old.
[EX A]: six

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

[EX Q]: Tadpoles undergo _ remarkable changes that are easy to observe.
[EX A]:
four