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

[EX Q]: All hairs have a life expectancy of _ to six years.
[EX A]: three

[EX Q]: Bacteria acquire genes conferring resistance in any of _ ways.
[EX A]: three

[EX Q]: Female fish have _ equally sized holes.
[EX A]:
two