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

Q: Ospreys reach sexual maturity between _ and five years of age.

A: three
****
Q: Diarrhea is an illness that kills _ and one-half million children per year.

A: three
****
Q: Sockeye salmon return to their natal stream to spawn after spending one to _ years in the ocean.

A:
four
****