Answer:
That doesn't mean a diverse group of many different organisms could live that way.
Step-by-step explanation:
First of all, this is a theory, nothing else. This means that they are no strong evidence and events that support this. Another important point is that scientists discover a type of BACTERIA, nothing else, which means that the living organism with this nature is unicellular, it's not a complex organism like multicellular. However, they conclude that a DIVERSE GROUP can live without oxygen, which is a lie, they are speculating.