TASK DEFINITION: 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.
PROBLEM: Question: Why do birds need a light-weight body? Answer: to stay aloft

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

PROBLEM: Question: Lyme disease is caused by what kind of organim? Answer: bacteria

SOLUTION: Lyme disease is caused by bacteria.

PROBLEM: Question: Which is a problem with using wind turbines to produce energy? Answer: Wind turbines are efficient only in certain areas.

SOLUTION:
Wind turbines are efficient only in certain areas is a problem with using wind turbines to produce energy.