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

[EX Q]: Calves grow quickly and are weaned from their mothers in only _ to four months.
[EX A]: three

[EX Q]: Pelycosaurs are a paraphyletic group of _ primitive families of synapsids.
[EX A]: six

[EX Q]: Most women have _ problems getting pregnant with a retroverted uterus.
[EX A]:
no