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

Q: Bacteria acquire genes for resistance in _ ways.

A: three
****
Q: Transitional milk is secreted between about four days and _ days postpartum.

A: ten
****
Q: Most bats return to their roosts by _ or five o'clock in the morning.

A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
four
****
