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

[EX Q]: Induction also operates early in development, even before the _ layered embryo forms.
[EX A]: three

[EX Q]: Most chicks are killed by predators in the first _ months of their life.
[EX A]: six

[EX Q]: Most mammals have _ cervical vertebrae, but sloths possess nine.
[EX A]:
seven