TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: All imaginary numbers are complex numbers with _ for the real part.

SOLUTION: zero

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

SOLUTION: three

PROBLEM: Spiders have one, two, or _ pairs of spinnerets.

SOLUTION:
three