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.

Q: Question: What is the only animal phyla that does not consist exclusively of invertebrates? Answer: chordates

A: Chordates is the only animal phyla that does not consist exclusively of invertebrates.
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Q: Question: Why do birds need a light-weight body? Answer: to stay aloft

A: Birds need a light-weight body for to stay aloft.
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Q: Question: Which of the following provides the best evidence that Earth has evolved over geologic time? Answer: rock containing fossilized seashells found on a mountaintop

A:
Rock containing fossilized seashells found on a mountaintop of the following provides the best evidence that earth has evolved over geologic time.
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