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

[EX Q]: Silkies have _ seasonal moults but little hair is dropped.
[EX A]: two

[EX Q]: Ozone is a gas that consists of _ atoms of oxygen.
[EX A]: three

[EX Q]: Female dogs come into heat every _ months or so.
[EX A]:
six