Let's get our tense straight. According to the TOE, we all started from one thing--some kind of goo, which became cells, bacteria, etc. By simple logic, at some point it was a one-and-then-the-other event.
Does the hypothesis of Abiogenesis say only one thing wriggled up out of the ooze?
Why don't you explain Abiogenesis to me so that I can understand it?