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

[Q]: Phosphates are made of _ phosphorus atom surrounded by four oxygen atoms.
[A]: one


[Q]: Female cats can go into heat for the first time as early as _ months of age.
[A]: five


[Q]: Caterpillars shed their skins _ or five times as they grow, in a process called molting.
[A]:
four