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

[EX Q]: Rattlers carry the eggs for six or _ months before giving birth.
[EX A]: seven

[EX Q]: Trees begin to bear _ to seven years after planting the root shoot.
[EX A]: five

[EX Q]: Willow flycatchers have a lifespan of _ to four years.
[EX A]:
three