Activity › Discussion › Science & Technology › How did life begin and evolve on earth? › Reply To: How did life begin and evolve on earth?
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Life likely began in Earth’s early oceans through the combination of simple organic molecules. These molecules formed self-replicating molecules like RNA, leading to the emergence of single-celled organisms. Over time, some organisms developed photosynthesis, which released oxygen and transformed the atmosphere. Complex cells with a nucleus (eukaryotes) evolved, followed by multicellular life. Through mutation, natural selection, and genetic drift, life diversified into various species, including plants, animals, and humans