Respuesta :
Answer:
microbes that left signs of their presence in rocks that are about 3.7 billion years old.
Explanation:
Answer:
After things cooled down, simple organic molecules began to form under the blanket of hydrogen. Those molecules, some scientists think, eventually linked up to form RNA, a molecular player long credited as essential for life's dawn. In short, the stage for life's emergence was set almost as soon as our planet was born