There is certainly a possibility for many universes out there somewhere with similar earths containing life as we know it, but showing scientifically these similar earths exist is the 64 trillion dollar question.
For right now, it is more of a
9 billion dollar question.
We do know our earth exists, and it seems to have a large number of very unique qualities necessary for life as we know it.
Life as we know it adapted to this planet and all of it's unique characteristics, so it not that surprising that life as we know it fits so well on a planet that life adapted to live on.
On another issue that I have been greatly critized for, I would ask those who believe "tilt only causes the earth's seasons in the northern hemisphere," show us how this is true if the earth did not also orbit around the sun?
The Earth's tilt is responsible for all of the seasons in all hemispheres. What we have been saying is that the change in energy per unit area (e.g. watts per meter squared) due to tilt far outweighs changes in energy per unit area due to the eccentricity of Earth's orbit. If the eccentricity of Earth's orbit were responsible for the seasons then it should be summer right now in both the northern and southern hemisphere because we come closest to the Sun this time of year.