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

Q: Pure water contains _ ions and is therefore a nonconductor .

A: no
****
Q: Sexual maturity is achieved by the age of _ months.

A: three
****
Q: Bilbies become mature at _ months of age when they are old enough to forage for themselves.

A:
six
****