How did our life begin?
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Answer:
Many scientists believe that RNA, or something similar to RNA, was the first molecule on Earth to self-replicate and begin the process of evolution that led to more advanced forms of life, including human beings
.Studies that track how life forms have evolved suggest that the earliest life on Earth emerged about 4 billion years ago. ... Some of the oldest evidence for life on Earth comes from ancient chemical signatures and fossils in sedimentary rocks in Canada, which likely formed on the ocean floor
.Others think life began in ponds on land, perhaps geothermal pools like those in Yellowstone. Many other locations have been proposed, such as ice. A minority of scientists argue that life must have begun elsewhere in the universe and been carried to Earth, an idea known as “panspermia”.
Explanation:
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Answer:
We know that life began at least 3.5 billion years ago, because that is the age of the oldest rocks with fossil evidence of life on earth. These rocks are rare because subsequent geologic processes have reshaped the surface of our planet, often destroying older rocks while making new ones.