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

[Q]: Snapdragons are annual flowering plants that grow _ to four feet and thrive on sunshine.
[A]: one

[Q]: Ospreys reach sexual maturity between _ and five years of age.
[A]: three

[Q]: Carbon atoms occur in _ different masses, or isotopes.
[A]:
three