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

Q: White sturgeon inhabit _ large river systems, all on the western coast of North America.

A: three
****
Q: Premolars have one, two, and sometimes _ canals.

A: three
****
Q: Some sea stars, like the purple sea star of the Gulf of Maine, have nine or _ arms.

A:
ten
****