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]: Potential energy is divided into ____ different types of energy.
[A]: three


[Q]: Most aquatic life does well in water with oxygen concentrations of ____ parts per million.
[A]: nine


[Q]: Mares generally give birth to ____ young every three years.
[A]:
one