There are even reasons to think a civilization existed over 300 million years ago. There are many past civilizations.
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Sep 19, 2022 · When did life on Earth begin? Earth is about 4.5 billion years old. Scientists think that by 4.3 billion years ago, Earth may have developed conditions suitable to support life. The oldest known fossils, however, are only 3.7 billion years old.
Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the process of evolution from a common ancestor.
Mar 8, 2024 · For millions of years, Earth was a hot and rocky planet. Scientists have some hypotheses on how life emerged amid such inhospitable terrain.
Scientists disagree about which chemical components of life came first, which of life’s processes came first, and where on Earth life first arose.
Oct 25, 2024 · Swedish chemist Svante A. Arrhenius suggested that life on Earth arose from “panspermia,” microscopic spores that wafted through space from planet to planet or solar system to solar system by radiation pressure. This idea, of course, avoids rather than solves the problem of the origin of life.
Oct 25, 2024 · Life - Evolution, History, Earth: The evidence is overwhelming that all life on Earth has evolved from common ancestors in an unbroken chain since its origin. Darwin’s principle of evolution is summarized by the following facts.
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The Earth formed roughly 4.5. billion years ago, and life probably began between 3.5. and 3.9. billion years ago. The Oparin-Haldane hypothesis suggests that life arose gradually from inorganic molecules, with “building blocks” like amino acids forming first and then combining to make complex polymers.
