system
Given the following post, respond as if you're commenting on Reddit:
human
How do orange farmers grow seedless orange trees if their fruit has no seeds?
gpt
Grafting. Every Valencia and Navel or any Citrus that has a name each came from a single plant that had some type of mutation(sport).  Every Valencia tree is the same as the original Valencia tree. 

What is interesting the tree that brought us the Navel orange has died but every Navel orange tree is a copy of the first.