system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why did Superman's parents send him alone? why didn't they send a female with him to procreate? how did they know he could mate with a human?
gpt
So, depending on which version of the origin, your answers are: they only had the one rocket prepared at the last minute and could only hold him, none of the other Kryptonians believed Jor-El when he said the planet was going to blow up and thus wouldn't trust their kids to some mad scientist to be rocketed off to space, and even if he couldn't mate with a human, he'd be alive on Earth, rather than dead on Krypton. (There are versions where Jor-El did pick Earth because we're similar enough to Kryptonians so that Kal-El wouldn't stand out, so presumably inter-breeding was a possibility?)

It's also a parable for Baby Moses being sent down the river to escape death, so that's also a thing.