TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Giraffes have two horns and _ or three knobs.

SOLUTION: two

PROBLEM: Plasma levels fall by about a half within three to _ hours.

SOLUTION: four

PROBLEM: Crustaceans have complicated life cycles sometimes involving _ separate metamorphoses.

SOLUTION:
four