Life on earth is likely evolved from organic bubble (or protocell) formed from natural catalyst and use energy from hydrothermal vent. DNA is believed to originated from self-replicated polymer allowing advantage in forming better bubble layer. With the long process of natural selection of part, the protocell transformed to single cell organism and start the life on earth.
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Answer 1:
The scientific consensus is that life began in the oceans around 3.5 billion years ago, starting with small microscopic cells which, over millions of years evolved into many different forms of multicellular, macroscopic life. Scientists don't know exactly how life began because it happened so long ago, but the basic ideas have been established and more research is being done. It is thought that once conditions on Earth were just right, the building blocks of life formed and were able to assemble themselves into primitive biological systems that would become the first cells. Lab experiments have proven that the building blocks of life (lipids, amino acids, nucleic acids, etc) can arise naturally. Life branched out into many different forms, and one lineage would eventually lead to humans. You may believe the answer below, but it is a religious story that is not universally believed, and creation stories vary throughout all the religions.
Answer 2:
Life began a very long time ago. God created life and all living things including us. He made the first man out of sand, and then he put him to sleep and made the first woman out of the man's ribs. I know it sounds confusing, but these first people lived until they were about 930 and were still having kids. Then God began to make the whole world flood. The world was so flooded that a very brave man had to make an Ark for several living creatures. At least 7 pairs of each kind of animal, plus people, plus food for everyone. It took this man, named Noah, to build the Ark 4 years. When the flood began, it went on for about 120 days, and took 7 weeks to dry from the whole world. It is a true story from The Bible. My teacher has it in one of her books, and I have my own at my house. And if you read through this whole thing, thank you for taking the time to read about God, and his children.
God bless you! Have a nice day.