instruction:
You are given a question, its answer, and a sentence that supports the question, i.e., the answer to the question is inferable from the sentence. In this task, you need to paraphrase the given sentence so that the paraphrased sentence still supports the question i.e. you can still infer the answer to the question from the paraphrased sentence. Do not write a paraphrase with a minor change in the given sentence e.g. replacing the word "one" with "a". Instead, try to write a paraphrase that contains new words, i.e. the words that are not present in the input sentence.
question:
Question: The bird ancestor that lived in trees developed what feature commonly associated with birds? 
Answer: wings. 
Sentence: The bird ancestor that lived in trees developed wings, which is commonly associated with birds.
answer:
Birds' ancestors, which lived in trees, developed the wings that are a feature commonly associated with birds.


question:
Question: Which of the following best explains why electrical wires are usually covered with plastic or rubber? 
Answer: to insulate the electrical wire. 
Sentence: Electrical wires are usually covered with plastic or rubber to insulate the electrical wire.
answer:
Covering electrical wires in rubber or plastic is a way to insulate the wires.


question:
Question: Which human organ system produces most of the hormones that regulate body functions? 
Answer: endocrine. 
Sentence: The endocrine system produces most of the hormones that regulate body functions.
answer:

Human body function is regulated by hormones that are primarily produced by the endocrine system.