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]: Water has _ characteristics that are particularly important to lakes.
[EX A]: two

[EX Q]: Autism is a developmental disability identified during the first _ years of life.
[EX A]:
three