There is no evidence for any satisfactory explanation. Hence it’s not known yet.
There are two popular assertions.
First, it is asserted that billions of years ago somewhere in the ocean necessary molecules came together. There is not enough evidence to turn this assertion into a theory.
Second, it is asserted that a piece of material carrying the first organism fell to the earth from space. There is not enough evidence to turn this assertion into a theory.
There are also other less popular assertions.
These assertions may be categorized as hypotheses. However, since there is not enough experimental evidence, calling them “scientific theory” would be incorrect.
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