问答题
《复合题被拆开情况》 Is there life anywhere in the universe other than on Earth? To answer that question, scientists look at outer space through telescopes.They send up rockets and satellites and study the information that comes back.Scientists also study life forms on Earth.They think about the features on Earth that support life.Every answer helps them to know what to look for in outer space.
【正确答案】liquid/ flowing water
【答案解析】文章第二段第二句提到，维持地球上的生命需要能量和流动的水。因此，填入liquid或flowing water。