Bacteria live off and on us. We don't live on them.

Let's be clear about colon bacteria, they are longer living and hardier than we are. Long after humans are gone, the bacteria will still rule earth. As they have for billions of years.

We will carry them into space and they will survive us on our habitats and the planets, there, too. Billions of years old, they will outlast us as they have already.

The lowly chloroplasts and MC also will, too. We are just the ways their nutrients are recycled, and increased.