Posted: Dec 20, 2017 11:17 am
by Sendraks
zulumoose wrote:How do we know how many times abiogenesis has happened?


Indeed.
The fossil record and the cambrian explosion do not provide clarity on whether any of those early lifeforms that didn't produce descendant species, were products of different abiogensis events. We know that life on earth today is the product of one abiogensis event but, that doesn't preclude there being other events at the same time which simply didn't produce lifeforms that were successful.