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

[EX Q]: Space is experienced as extended in _ dimensions.
[EX A]: three

[EX Q]: Sharks can have from five to _ gills.
[EX A]: seven

[EX Q]: Process color uses a combination of _ separate inks to create a full-color image.
[EX A]:
four