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.

[EX Q]: Spermatogenesis creates ____ sperm of equal size.
[EX A]: four

[EX Q]: Casinos have ____ windows and they have no clocks.
[EX A]: no

[EX Q]: Ciliates are the least numerous of the ____ animals.
[EX A]:
four