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.

Ferrets normally tremble for ____ reasons.
two

Argentine ants are able to establish new colonies with as little as ten worker ants and ____ queen.
one

Elephants have four molars, which are replaced five times, for a total of ____ sets in a lifetime.

six