TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Flexible shapes are also shapes which have _ obvious way of being attacked.

SOLUTION: no

PROBLEM: Many prosimians have at least _ nipples and produce litters rather than a single offspring.

SOLUTION: four

PROBLEM: Tarantulas have _ pairs of book lungs.

SOLUTION:
two