Scientists believe life originated on Earth around 3.5 to 4 billion years ago. This is based on fossil evidence of simple life forms found in rocks dating back to that time period and the presence of key molecules necessary for life in early Earth environments.
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Scientists believe life may have originated in Africa because the continent has a diverse range of habitats and a long history of supporting life. Fossil evidence suggests that early human ancestors originated in Africa, leading to the idea that life itself may have emerged there as well. Additionally, Africa's unique geology and climate are believed to have provided favorable conditions for the development of early life forms.
Scientists believe in the theory of universal common ancestry because of evidence like the genetic code shared by all living organisms, similarities in biochemical processes, and the fossil record showing the progression of life forms over time. This theory provides a coherent explanation for the diversity and unity of life on Earth.
near deep-sea hydrothermal vents
Scientists believe that the molecule that came first in the evolution of life on Earth is RNA (ribonucleic acid).
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We have fossils, so to speak, in rocks that are about 3.5 billion years old. Some form of simple prokayote in filamentous strings. Impressions left in sedimentary rock.' Still there must have been life before this, but the evidence is implied genetics and not all that firm. Possible a form of replicator; simple genetic replication.
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Life originated from Life.
Many scientists believe it is possible for life to exist outside of planet Earth, especially on planets with conditions similar to Earth. However, no evidence of extraterrestrial life has been confirmed. The search for life beyond Earth continues through missions to Mars and other celestial bodies.
cell form and larva in the water witch grew to fish to monkey to man
Scientists believe life may have originated in Africa because the continent has a diverse range of habitats and a long history of supporting life. Fossil evidence suggests that early human ancestors originated in Africa, leading to the idea that life itself may have emerged there as well. Additionally, Africa's unique geology and climate are believed to have provided favorable conditions for the development of early life forms.
Given the size of the universe, it is almost impossible for Earth to be the only place where life has developed. Some scientists also just want to know what is there; they don't believe or disbelieve, but want to find out.
Scientists have fossil evidence supporting the idea that life originated from simple, single-celled organisms that emerged over 3.5 billion years ago. Fossils of these early microorganisms, such as cyanobacteria, provide insights into the evolution of life on Earth.
You need water to live and other planets don't have water
Although there are many different hypotheses for how exactly, most scientists in the life sciences believe that life emerged on Earth through a series of biochemical processes.