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

[EX Q]: Some species bear living offspring only every _ to five years.
[EX A]: three

[EX Q]: Some bird feeders have _ perches at all, but neither do tree trunks.
[EX A]: no

[EX Q]: Black bears stand _ to six feet long and almost three feet at the shoulders when on all fours.
[EX A]:
five