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]: Maps are ____ dimensional representations of the earth's surface.
[A]: two


[Q]: Avian kidneys have ____ kinds of nephrons.
[A]: two


[Q]: Ants have ____ sets of jaws.
[A]:
two