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

[EX Q]: Most crops require at least _ to eight hours of full sun a day to thrive.
[EX A]: six

[EX Q]: Immune response improves in about _ weeks.
[EX A]: four

[EX Q]: Burmese pythons reach sexual maturity in _ to five years.
[EX A]:
four