Tempering

There were hundreds of thousands of worlds in the universe where humanity existed, but none of them were similar to each other.

Some were so ancient that their origin could be dated back to the creation of the universe while some were basically akin to a newborn baby, some were so big that they were comparable to the solar system where Earth was while some were even smaller than the moon orbiting around Earth.

The same could also be said with human genetics. Most civilization came from an influence of higher realm humans who came into the primitive ones. However, during this entire process, the genetics would gradually change, dwindling and developing into other directions in the evolutionary path.

Hence, no human had the same quality of body.