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

[Q]: Most children start to get their adult teeth at about _ years of age.
[A]: six


[Q]: Territorial groups consist of one supermale or terminal male and _ to three females.
[A]: one


[Q]: Bovine insulin differs from human in only _ amino acid residues, and porcine insulin in one.
[A]:
three