Historically how has the origin of life on earth beenexplained?

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Nestor RutherfordLv2

28 Sep 2019

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1. Francis Crick, the co-discoverer of the structure of DNA and an important science policy-maker, suggested that the three kingdoms of life could represent survivors of microbes that were sent deliberately to the early Earth from another planet. Other scientists have invoked a less intentional origin for the building blocks of life on Earth on comets.

a. Why do these scientists invoke an extraterrestrial origin for life? What aspects of the chemical and geological records of early Earth and early life support their view?

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