The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

Scientists have found that life can survive in boiling pools of toxic water at Yellowstone National Park, something they did not think was possible. The fact that life can thrive in a boiling pool brings up all sorts of ideas about the origins of life. It may be that the first life on Earth was in the places humans might consider hospitable.
Finding life in unusual（）