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]: Prairie dogs bear four or ____ young per litter.
[A]: five


[Q]: Atoms are extremely small, on the order of a few ____ billionths of a meter.
[A]: ten


[Q]: Cognitive models describe ____ different information gathering and processing types.
[A]:
four