There almost couldn't be evidence of multiple genesis events. There could have been a million or a billion-quadrillion and we wouldn't know it. No bones, no fossils, no remnants except their progeny. <br><br>New abiogenesis events might occur every few minutes and we wouldn't know it. They would be clumsy mush, born into a highly developed ecosystem. Tiny, defenseless snacks for 4 billion year old superpredators.