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.

Monatomic elements have with ____ atoms in each per molecule.
three

Elephants also have four molars, ____ on the top and one on the bottom on both sides of the mouth.
one

Ants have ____ stages in their life cycle.

four