TASK DEFINITION: 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.
PROBLEM: 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.

SOLUTION: Birds' ancestors, which lived in trees, developed the wings that are a feature commonly associated with birds.

PROBLEM: Question: The sum of all chemical reactions that take place within an organism is known as? 
Answer: metabolism. 
Sentence: The sum of all chemical reactions that take place within an organism is known as metabolism.

SOLUTION: An organism's metabolism is determined by the breakdown of all chemical reactions operating within the body.

PROBLEM: Question: What is it called when birds keep their eggs warm while the embryos inside develop? 
Answer: incubation. 
Sentence: Incubation is when birds keep their eggs warm while the embryos inside develop.

SOLUTION:
Bird embryo development is dependent on proper incubation. Incubation is when birds keep their eggs warm while the embryos develop inside.