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

[EX Q]: White sturgeon inhabit _ large river systems, all on the western coast of North America.
[EX A]: three

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

[EX Q]: Cutaneous lesions develop _ days after the onset of the attack.
[EX A]:
three