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

[EX Q]: Porphyritic textures form primarily because of _ rates of cooling.
[EX A]: two

[EX Q]: Babies are born about _ weeks after mating.
[EX A]: five

[EX Q]: Ozone is formed of _ atoms of oxygen.
[EX A]:
three