In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Question: Adulthood is divided into how many stages? Answer: three
Adulthood is divided into three stages.

Question: All of the land drained by a river system is called its basin, or what "wet" term? Answer: watershed
All of the land drained by a river system is called its basin, or the "wet" term  watershed

Question: The complement system is a series of proteins constitutively found in the what? Answer: blood plasma

The complement system is a series of proteins constitutively found in the blood plasma.