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

Q: Some bird feeders have _ perches at all, but neither do tree trunks.

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

A: three
****
Q: Breast cancer is a common disease, affecting _ in nine women during their lifetime.

A:
one
****