TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Whales have only _ enemies-man and the killer whale.

SOLUTION: two

PROBLEM: Humans host _ species of louse, the head louse , the body louse and the pubic louse .

SOLUTION: three

PROBLEM: Nymphs develop through _ growth stages, or instars, and have incomplete metamorphosis.

SOLUTION:
five