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

[EX Q]: Mental illness affects _ out of four families in America.
[EX A]: one

[EX Q]: Spatial sensors work in one, two, or _ dimensions.
[EX A]: three

[EX Q]: Diploid organisms contain _ copies of each gene.
[EX A]:
two