>If we believe the first form of life occurred on the sea floor, why shouldn't we believe that new forms of life are spontaneously occurring on the sea floor all the time?
I'd be very surprised if such spontaneous life could compete against life with millions of years of evolution behind it. As to eukaryotes, them arising seems to be a much more unlikely proposition so I'd be surprised if it happened more than once given that it took an order of magnitude more time to happen once the conditions were right.
Perhaps at a species level it may haven't happened many times, that is, a species of bacteria was ingested, or took harbor in, a larger cell. But if it worked once, it worked thousands if not millions of times.
I'd be very surprised if such spontaneous life could compete against life with millions of years of evolution behind it. As to eukaryotes, them arising seems to be a much more unlikely proposition so I'd be surprised if it happened more than once given that it took an order of magnitude more time to happen once the conditions were right.
https://en.wikipedia.org/wiki/Timeline_of_the_evolutionary_h...