In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[Q]: Y are _ morphisms and g is quasi-compact and surjective.
[A]: two


[Q]: Armaments manufacturers use lithium to produce tritium in _ ways.
[A]: two


[Q]: Ants have _ pairs of legs, all originating in the thorax.
[A]:
three