Given a statement, generate a question such that the answer is contained in that statement.

[EX Q]: at least one in every five people in the world is in a time of significant mental, emotional and social changes.
[EX A]: How many people in the world are in a time of significant mental, emotional and social changes?

[EX Q]: simple green plants play significant roles as food in aquatic ecosystems
[EX A]: What type of ecosystems do simple green plants play a significant role in?

[EX Q]: most species go through vulnerable stages after birthing
[EX A]:
What stage do most species go through after birthing?