system
Given the following post, respond as if you're commenting on Reddit:
human
[DC Comics] If kryptonians and humans are so genetically different, why was Jon Kent able to be born? Is Jon Kent infertile bexause he’s a mix of different species? Or are humans and kryptonians similar enough to have children?
gpt
Unlikely isn’t the same as impossible. As unlikely as it is for two different species from different planets to be able to mate with each other, the fact that it did happened means that we have to accept it as possible.

Since Jon is often shown having descendants in Future timelines, they must be interfertile.