How is aquatic life found everywhere?

Question

I can’t tell if I’m in r/no stupid questions territory here but I was just thinking about how their are fish, shellfish, etc. found all over the world. It’s easy for me to see how land dwelling species moved all over the world but how did aquatic life do it?

In: 1

Answer 1

I always knew fish were great travelers, but didn’t expect them to have their own frequent swimmer program.