Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Q: Gibberellins are diterpenoids derived from four isoprenoid units forming a system of ____ rings.

A: four
****
Q: Plants produce seed at ____ years of age.

A: eight
****
Q: Calves grow quickly and are weaned from their mothers in only ____ to four months.

A:
three
****