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.

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

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

Input: Consider Input: Question: Why do birds need a light-weight body? Answer: to stay aloft

Output: Birds need a light-weight body for to stay aloft.

Input: Consider Input: Question: What causes cumulus clouds to grow upward? Answer: convection currents
Output: Convection currents causes cumulus clouds to grow upward.