Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Life probably began in the oceans. No one knows exactly how or when. Life may have originated more than once. If life began before the Moon formed, that impact would have wiped it out. Then life would have had to originate again. Eventually conditions on Earth became less violent. The planet could support life. Answer: oceans
Life probably began where?